Custom Styling Guide

This guide provides the complete default CSS used by the FastComments commenting widget (v2) and some instructions for overriding the styles.

Understanding the default CSS allows you to:

Customize the appearance by overriding specific styles
Troubleshoot styling issues by seeing which classes and selectors are available
Build custom themes that work with the widget's structure
Use with AI assistants to generate custom CSS modifications.

How to Override Styles

Overriding styles varies based on the widget. For the comment widget, you have to use the customCSS config parameter to pass the CSS into the iframe, or specify the CSS in the Customization page in the admin dashboard which will serve the CSS from our CDN.

You can customize the comment widget styling in two ways:

Option 1: Via customCSS Parameter

Pass your custom CSS as a string to the customCSS parameter when initializing the widget:

window.fcConfigs = [{
    target: '#fastcomments-widget',
    tenantId: 'your-tenant-id',
    customCSS: `
        .fast-comments .comment {
            background-color: #f0f0f0 !important;
            border-radius: 8px !important;
        }
    `
}];

Option 2: Via Admin Dashboard

Go to the Widget Customization page in your admin dashboard
Scroll to the "Custom CSS" section under "Advanced"
Enter your custom CSS
Click "Save"

Your custom CSS will be applied to all comment widgets on your site.

Tips

Use !important to override default styles if needed
Target specific selectors to avoid affecting other parts of your site
Test your CSS in different browsers for compatibility
The widget uses standard CSS - no special preprocessors required

Comment Widget Styling Reference (v2, latest)

Comment Widget Default CSS

Copy

body { margin: 0; padding: 0; }
    d { display: block }
    @keyframes pop-in { 0% { transform: scale(0.3); } 50% { transform: scale(1.1); } 100% { transform: scale(1); } }
    @keyframes placeHolderShimmer { 0% { background-position: 0 0 } 100% { background-position: 100% 0 } }
    .comment-reply .comment-input.animated-background, .comment-reply input.animated-background, .animated-background { animation-duration: 1s; animation-iteration-count: infinite; animation-name: placeHolderShimmer; background: #f6f7f8; background: linear-gradient(to right, #eee 8%, #dddddd 18%, #eee 33%); background-size: 50% 50%; }
    @keyframes backgroundToNormal { from { background: lightblue } to { background: inherit } }
    .fast-comments { position: relative; width: 100%; font-size: 13px }
    .hidden { display: none }
    .invisible { visibility: hidden }
    .inline-block { display: inline-block }
    .icon { display: inline-block; width: 24px; height: 24px; vertical-align: middle; image-rendering: -webkit-optimize-contrast; }
    .icon.bubble { background: url("${FC_CDN}/images/svg/v2/text_bubble_dark.svg") no-repeat center; background-size: 22px 22px; }
    .icon.bubble-white { background: url("${FC_CDN}/images/svg/v2/text_bubble_white.svg") no-repeat center; background-size: 22px 22px; }
    .icon.cross { background: url("${FC_CDN}/images/svg/v2/close.svg") no-repeat center; background-size: 9px 9px; }
    .icon.reply-arrow-inactive { background: url("${FC_CDN}/images/svg/v2/reply_inactive.svg") no-repeat center; background-size: 15px 15px; }
    .icon.reply-arrow-active { background: url("${FC_CDN}/images/svg/v2/reply.svg") no-repeat center; background-size: 15px 15px; }
    .icon.up { background: url("${FC_CDN}/images/svg/v2/thumbs_up_light.svg") no-repeat center; background-size: 12px 12px; }
    .icon.up.active, .icon.up:hover { background: url("${FC_CDN}/images/svg/v2/thumbs_up_dark.svg") no-repeat center; background-size: 12px 12px; }
    .icon.down { background: url("${FC_CDN}/images/svg/v2/thumbs_down_light.svg") no-repeat center; background-size: 12px 12px; }
    .icon.down.active, .icon.down:hover { background: url("${FC_CDN}/images/svg/v2/thumbs_down_dark.svg") no-repeat center; background-size: 12px 12px; }
    .icon.pin-small { background: url("${FC_CDN}/images/svg/v2/pin.svg") no-repeat center; background-size: 15px 15px; }
    .icon.logo { width: 27px; height: 33px; background: url("${FC_CDN}/images/svg/v2/logo.svg") no-repeat center; background-size: 22px;  }
    .icon.edit-small { background: url("${FC_CDN}/images/svg/menu.svg") no-repeat center; background-size: 17px 17px; }
    .icon.edit-big { background: url("${FC_CDN}/images/svg/v2/edit.svg") no-repeat center; background-size: 22px 22px; }
    .icon.trash { background: url("${FC_CDN}/images/svg/v2/trash_thin.svg") no-repeat center; background-size: 22px 22px; }
    .icon.eye { background: url("${FC_CDN}/images/svg/v2/view.svg") no-repeat center; background-size: 22px 22px; }
    .icon.eye-slash { background: url("${FC_CDN}/images/svg/v2/view_hide.svg") no-repeat center; background-size: 22px 22px; }
    .icon.replied { background: url("${FC_CDN}/images/svg/v2/replied.svg") no-repeat center; background-size: 22px 22px; }
    .icon.bold { background: url("${FC_CDN}/images/svg/v2/editor_bold.svg") no-repeat center; background-size: 9px; }
    .icon.ul { position: relative; top: 1px; background: url("${FC_CDN}/images/svg/v2/editor_underline.svg") no-repeat center; background-size: 10px; }
    .icon.it { background: url("${FC_CDN}/images/svg/v2/editor_itallic.svg") no-repeat center; background-size: 7px; }
    .icon.s { background: url("${FC_CDN}/images/svg/v2/editor_strike.svg") no-repeat center; background-size: 10px; }
    .icon.code { background: url("${FC_CDN}/images/svg/v2/editor_embed.svg") no-repeat center; background-size: 16px; }
    .icon.link { position: relative; top: -1px; background: url("${FC_CDN}/images/svg/v2/editor_link.svg") no-repeat center; background-size: 14px; }
    .icon.img-up { background: url("${FC_CDN}/images/svg/v2/editor_image.svg") no-repeat center; background-size: 16px; }
    .icon.img-btn-wrap { position: relative; }
    .icon.return { background: url("${FC_CDN}/images/svg/return.svg") no-repeat center; background-size: 22px; margin-left: 6px; }
    .icon.gif { width: auto; height: auto; font-size: 0; }
    .icon.gif::before { content: "GIF"; font-size: 12px; }
    .icon.gif::before, .t-btn.txt { display: inline-block; width: auto; height: auto; margin-right: 3px; text-align: center; vertical-align: middle; font-weight: 500; }
    .icon.bell { background: url("${FC_CDN}/images/svg/v2/bell.svg") no-repeat center; background-size: 22px; }
    .icon.bell-red { background: url("${FC_CDN}/images/svg/v2/bell-red.svg") no-repeat center; background-size: 22px; }
    .divider { display: inline-block; height: 25px; margin: 0 10px; vertical-align: middle; border-right: 1px solid #c2c2c2; }
    .icon.block { background: url("${FC_CDN}/images/svg/v2/ban.svg") no-repeat; background-size: 22px 22px; }
    .icon.flag { background: url("${FC_CDN}/images/svg/flag.svg") no-repeat; background-size: 22px 22px; }
    .icon.flag-small { background: url("${FC_CDN}/images/svg/flag.svg") no-repeat center; background-size: 15px 15px; }
    .select-dir-wrapper { clear: both; text-align: right; border-bottom: 1px solid #afafaf; }
    .select-dir-wrapper .comment-count { float: left; font-weight: 500; }
    .select-dir-wrapper > * { margin: 9px; height: 16px }
    .select-dir { display: inline-block }
    .dropdown { position: relative; z-index: 3; text-align: right }
    .dropdown .drop-label { padding: 0 0 7px 0; cursor: pointer; font-weight: 500 }
    .dropdown .drop-label i { position: relative; display: inline-block; top: -2px; font-size: 7px }
    .dropdown .items { position: absolute; display: none; top: 20px; right: 0; width: 150px; overflow: hidden; border-radius: 0 0 4px 4px; background: #fff; }
    .dropdown:hover .items { position: absolute; display: block }
    .dropdown .items > * { padding: 5px 9px; cursor: pointer; font-weight: 500; text-align: left; font-size: 13px }
    .no-comments { clear: both; text-align: center; font-weight: 500; font-size: 16px; }
    .new-comments-message { width: fit-content; margin: 20px auto 0; padding: 5px 10px; text-align: center; cursor: pointer; font-weight: 500 }
    .new-comments-message .new-comments-count { pointer-events: none; position: relative; top: 1px; display: inline-block; min-width: 12px; padding: 2px 5px 4px 5px; margin-right: 3px; border: 1px solid #a2a2a2; border-radius: 4px 0 4px 4px; }
    .new-comments-message span { pointer-events: none; padding-bottom: 2px; border-bottom: 1px solid #a3a3a3; }
    .comment .new-comments-message { margin: 10px auto 0; }
    .sso-login-wrapper, .fastcomments-message-wrapper { display: flex; height: fit-content; min-height: 130px; padding: 30px 0; box-sizing: border-box; align-items: center; justify-content: center; border: 1px solid #bfbfbf; border-radius: 0 11px 11px 11px; }
    .sso-login-wrapper .message-text, .fastcomments-message-wrapper .message-text { display: inline; pointer-events: none; }
    .fastcomments-message-wrapper .message-text a { color: #fff; pointer-events: all; }
    .sso-login-wrapper .sso-login, .fastcomments-message-wrapper .fastcomments-message { display: inline-block; animation: pop-in 0.5s; animation-timing-function: ease; padding: 10px 17px 10px 27px; border-radius: 0 7px 7px 7px; background: #333; color: #fff; text-decoration: none; font-size: 17px; font-weight: 500; }
    .fastcomments-message-wrapper .fastcomments-message { margin: 0 5%; cursor: default; }
    .sso-login-wrapper .sso-login[href] { cursor: pointer; }
    .sso-login-wrapper .sso-login .message-text, .fastcomments-message-wrapper .fastcomments-message .message-text { margin-right: 10px; }
    .sso-login-wrapper .sso-login .icon, .fastcomments-message-wrapper .fastcomments-message .icon { pointer-events: none; }
    .sso-login-wrapper .sso-login.clickable { cursor: pointer; }
    .comment .sso-login-wrapper { padding: 7px 0; text-align: left }
    .comment .sso-login-wrapper .sso-login { font-size: 16px }
    .default-hidden { transition-duration: 300ms }
    .comment-input:not(.show-default-hidden) .default-hidden { height: 0; margin: 0 !important; opacity: 0; pointer-events: none; transition-duration: 200ms }
    .loading .pagination { opacity: 0.5; pointer-events: none; }
    .card { border: 1px solid #d0d0d0; background: #fdfdfd; border-radius: 3px; box-shadow: 5px 5px 7px rgba(0,0,0,.1) }
    button, .button { display: inline-block; margin-bottom: 10px; padding: 4px 10px; border-radius: 0 7px 7px 7px; font-size: 15px; background: #fbfbfb; color: #333; text-decoration: none; border: 1px solid #a2a2a2; cursor: pointer }
    .fast-comments, textarea { font-family: -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Oxygen,Ubuntu,Cantarell,"Open Sans","Helvetica Neue",sans-serif }
    textarea::placeholder { font-size: 13px; font-weight: 500; transition-duration: 150ms }
    textarea:focus::placeholder { color: transparent }
    .fc-red { display: inline-block; margin: 5px; color: #ff0000 }
    .comment-error { padding: 10px }
    input, textarea { padding: 12px 20px; border: 1px solid #bfbfbf; border-radius: 0 11px 11px 11px; box-sizing: border-box; outline: none; background: transparent; }
    input { padding: 9px 12px; border-radius: 0 6px 6px 6px; }
    input:focus, textarea:focus, textarea:focus + .horizontal-border-wrapper, .comment-input textarea:focus { border-color: #555 } /* .comment-reply textarea:focus for ssr */
    .pagination { margin-top: 50px; line-height: 19px; text-align: center; user-select: none; }
    .pagination > * { display: inline-block; cursor: pointer; font-weight: 700; }
    .pagination > * > span { font-weight: normal; pointer-events: none; }
    .pagination > * > span::before { content: "("; }
    .pagination > * > span::after { content: ")"; }
    .pagination .load-next-page { padding-right: 25px; }
    .pagination .load-all { padding-left: 25px; border-left: 2px solid #555; } /* important that border is on the one to the right, as it doesn't always show */
    .comments-toggle { display: block; width: fit-content; margin: 20px auto; cursor: pointer; padding: 10px 17px 10px 27px; border-radius: 7px; background: #333; color: #fff; text-decoration: none; font-size: 17px; font-weight: 500; user-select: none; }
    .replying-to { margin-bottom: 5px }
    .comment-reply { position: relative; width: 100%; margin: 10px 0 15px 0; }
    .comment-reply.root { padding: 15px; box-sizing: border-box; }
    @media(max-width: 500px) { .comment-reply.root { padding: 15px 5px 15px 5px; } }
    .comment-reply .fast-comments-waiting { display: block; margin: 5px 0 }
    .comment-reply .comment-reply-top-bar { position: relative; min-height: 25px; margin: 0 26px 15px 26px; line-height: 25px; } /* relative positioned for things like notifications list */
    .comment-reply .comment-reply-top-bar .logged-in-info { display: inline-block; width: calc(100% - 60px); min-width: 150px; }
    .comment-reply .comment-reply-top-bar .logged-in-info .avatar { display: inline-block; height: 25px; vertical-align: middle; margin-right: 5px; border-radius: 25px; overflow: hidden; box-shadow: 3px 3px 3px 0 rgba(0, 0, 0, 0.07); font-size: 0; }
    .comment-reply .comment-reply-top-bar .logged-in-info .avatar .open-profile { cursor: pointer; }
    .comment-reply .comment-reply-top-bar .logged-in-info .avatar.animated-background img { opacity: 0.1; }
    .comment-reply .comment-reply-top-bar .logged-in-info .avatar img { width: 25px; height: 25px; object-fit: cover; }
    .comment-reply .comment-reply-top-bar .logged-in-info .username { display: inline-block; max-width: calc(50% - 25px); overflow: hidden; vertical-align: middle; text-overflow: ellipsis; font-weight: 700; white-space: nowrap; }
    .comment-reply .comment-reply-top-bar .logged-in-info .badges { display: inline-block; margin-left: 5px; }
    .comment-reply .comment-reply-top-bar .right { float: right; }
    .comment-reply .comment-reply-top-bar .right > * { display: inline-block; }
    .comment-reply .comment-reply-top-bar .right .menu { font-weight: 500; font-size: 11px; }
    .comment-reply .comment-reply-top-bar .right .menu:hover { z-index: 9002; }
    .comment-reply .comment-reply-top-bar .right .menu .drop-label i { display: inline-block; width: 4px; height: 4px; background: #333; border-radius: 4px; margin: 0 2px; }
    .comment-reply .comment-reply-top-bar .right .menu .items { top: 25px; padding: 20px; box-shadow: 2px 3px 6px rgba(0, 0, 0, 0.1); border-radius: 10px 0 10px 10px; }
    .comment-reply .comment-reply-top-bar .right .menu .items > * { font-weight: 700; }
    .comment-reply .comment-reply-top-bar .right .notification-bell { position: relative; margin-left: 5px; cursor: pointer; }
    .comment-reply .comment-reply-top-bar .right .notification-bell .count { position: absolute; top: -3px; left: 19px; min-width: 15px; height: 15px; text-align: center; font-size: 11px; pointer-events: none; color: red; display: none; }
    .comment-reply .comment-reply-top-bar .right .notification-bell .icon.bell-red { display: none; }
    .comment-reply .comment-reply-top-bar .right .notification-bell > * { pointer-events: none; }
    .comment-reply .comment-reply-top-bar .right .notification-bell.has-notifications .icon.bell { display: none; }
    .comment-reply .comment-reply-top-bar .right .notification-bell.has-notifications .icon.bell-red { display: inline-block; }
    .comment-reply .comment-reply-top-bar .right .notification-bell.has-notifications .count { display: block; }
    .toolbar { position: relative; display: inline-block; margin: 5px 0 0 0; font-size: 13px }
    .toolbar .t-btn { display: inline-block; margin: 0 1px; vertical-align: middle; cursor: pointer; transition-duration: 200ms; user-select: none; }
    .toolbar .t-btn:hover { opacity: 0.7; }
    .toolbar .img-btn-wrap { display: inline-block; overflow: hidden }
    .toolbar .t-btn input[type=file] { position: absolute; padding: 40px; font-size: 100px; top: 0; left: 0; opacity: 0; cursor: pointer }
    .commenty-input:not(.show-default-hidden) .toolbar { width: 100%; margin-top: -50px; }
    @media(max-width: 500px) { .toolbar { display: flex; width: 100%; padding-bottom: 12px; justify-content: space-evenly; } }
    @media(max-width: 500px) { .comment-input .toolbar { margin-top: 50px; border-bottom: 1px solid #bfbfbf; } }
    .comment-reply .auth-input, .comment-vote-auth.auth-input { margin: 10px 0; font-size: 13px }
    .comment-reply .auth-input .fc-login { margin: 10px 0 0; }
    .comment-reply .auth-input .reasoning, .comment-vote-auth.auth-input .reasoning { font-weight: 600; }
    .comment-reply .auth-input .fc-red, .comment-vote-auth.auth-input .fc-red { display: block }
    .comment-reply .auth-input input, .comment-vote-auth.auth-input input { width: 100%; margin-top: 10px; padding: 9px 12px; border-radius: 0 6px 6px 6px; font-size: 14px; border: 1px solid #a2a2a2; }
    .comment-reply .auth-input .solicitation-info, .comment-vote-auth.auth-input .solicitation-info { margin-top: 10px; }
    .comment-reply .auth-input .fast-comments-reply { margin-top: 10px; padding: 10px 45px; border-radius: 5px 0 5px 5px; background: #333; color: #fff; border: none; }
    .comment-input, .comment-edit { position: relative; padding-bottom: 30px; border-radius: 0 11px 11px 11px; }
    .comment-input textarea { display: block; width: 100%; height: 130px; padding: 15px 25px 15px 15px; resize: none; font-size: 16px; border-bottom: none; border-radius: 0 11px 0 0; }
    .comment-input textarea::placeholder { font-size: 16px; font-weight: 400; }
    .comment-input input { display: block; width: 100%; font-size: 14px; }
    .comment-input .fastcomments-message-wrapper { border: 1px solid #bfbfbf; border-bottom: none; border-radius: 0 11px 0 0; }
    .comment-input input[name=fastcomments-link] { display: block; width: 100%; margin: 10px 0; }
    .comment-input .horizontal-border-wrapper { pointer-events: none; border-color: #bfbfbf; }
    .comment-input .horizontal-border { position: absolute; height: 20px; border-bottom: 1px solid; border-color: inherit; }
    .comment-input .horizontal-border-left { bottom: 0; left: 0; border-radius: 0 0 0 11px; }
    .comment-input .horizontal-border-right { bottom: 0; right: 0; width: 20px; border-radius: 0 0 11px 0; }
    .comment-input .horizontal-border-top-left, .comment-input .horizontal-border-top-right { display: none; position: absolute; top: 20px; border-bottom: 0; border-top: 1px solid; border-color: inherit; }
    .comment-input .horizontal-border-top-right { top: 0; right: 0; border-radius: 0 11px 0 0; width: 20px; }
    .comment-input .horizontal-border-top-left { top: 0; left: 0; }
    .comment-input .horizontal-border-bottom-left { position: absolute; height: 30px; width: 15px; left: 0; bottom: 0; border-color: inherit; border-left-width: 1px; border-left-style: solid; border-radius: 0 0 0 11px; }
    .comment-input .horizontal-border-bottom-right { position: absolute; height: 30px; width: 15px; right: 0; bottom: 0; border-color: inherit; border-right-width: 1px; border-right-style: solid; border-radius: 0 0 11px 0; }
    .comment .comment-input .horizontal-border-top-left, .comment .comment-input .horizontal-border-top-right { display: block }
    @media(max-width: 500px) { .comment-input textarea, .comment-input .fastcomments-message-wrapper { height: 130px;  } }
    .comment .reply-button-wrapper { position: relative; float: right; top: -19px; right: 26px; border-radius: 0 7px 7px 7px; }
    .comment .fast-comments-reply, .comment .edit-save { padding: 10px 27px; border-radius: 0 7px 7px 7px; background: #333; color: #fff; text-decoration: none; }
    .comment .cancel-button-wrapper { position: absolute; top: 9px; right: 25px; border-radius: 4px; }
    .comment .comment-edit .cancel-button-wrapper { top: -13px }
    .comment .fast-comments-reply-cancel { margin-bottom: 0; padding: 1px 1px; border-radius: 4px; }
    .comment .fast-comments-reply-cancel .cross { pointer-events: none; }
    .comment-reply.root .reply-button-wrapper { position: relative; float: right; top: -20px; right: 27px; margin-bottom: 10px; border-radius: 0 7px 7px 7px; }
    .comment-reply.root button { margin-bottom: 0; padding: 7px 20px; font-weight: 600; }
    .comment-reply.root button .bubble { margin-left: 10px; pointer-events: none; }
    .comments { clear: both; padding: 15px 0; }
    @media(max-width: 500px) { .comments { padding: 15px 5px; } }
    .comment { position: relative; margin-top: 15px }
    @media(max-width: 500px) { .comment { margin-top: 5px; } }
    .comment .comment-text spoiler:not(:hover) { background: #eee; color: #eee; border: 1px dotted #a2a2a2; }
    .comment .comment-text .inline-image { display: block; max-width: 500px; margin: 3px 0 3px 0 } /* must not select inline-image in wysiwyg */
    .comment .comment-text .inline-image img { max-width: 100%; max-height: 400px } /* must not select inline-image in wysiwyg */
    .disable-image-redirect .comment .inline-image { cursor: default; }
    .comment.is-live > .inner { animation: backgroundToNormal 1.5s }
    .comment.is-unread > .inner .avatar-wrapper { box-shadow: 0 0 20px #89f796; }
    .comment.unverified > .commenter-name, .comment.unverified > .comment-content .commenter-name { opacity: 0.7 }
    .comment.unverified > .comment-content > .comment-text { opacity: 0.7 }
    .comment.is-spam > .comment-content { border: 1px solid red; } /* can be set when saving comment initially */
    .comment.is-unapproved > .comment-content { border: 1px solid #ffa700; } /* can be set when saving comment initially */
    .comment.is-blocked > .inner > .comment-content > .comment-text { max-height: 40px; overflow: hidden; }
    .comment > .requires-verification-approval { margin: 3px 0 6px }
    .comment > .inner > .spam-notice { margin: 0 0 10px 0; font-size: 12px; color: red }
    @media(max-width: 500px) { .comment > .inner > .spam-notice { margin-top: 18px; } }
    .comment .avatar-wrapper { position: relative; display: inline-block; width: 56px; height: 56px; overflow: hidden; box-shadow: 3px 3px 5px 0 rgba(0, 0, 0, 0.10); border-radius: 15px 0 15px 15px; vertical-align: top; }
    .comment .avatar-wrapper.anon { border: 1px solid #3f3f3f; }
    .comment .avatar-wrapper .open-profile { cursor: pointer; }
    .comment .avatar-wrapper.animated-background img { opacity: 0.1; }
    @media(max-width: 500px) { .comment .avatar-wrapper { width: 36px; height: 36px; } }
    .comment .avatar { width: 100%; height: 100%; object-fit: cover; }
    @media(max-width: 500px) { .comment .avatar { vertical-align: middle } }
    .comment .commenter-name .badges { margin-bottom: 5px; }
    .badges .badge { display: inline-block; vertical-align: middle; line-height: initial; margin: 3px 5px 3px 0; padding: 5px 7px; cursor: default; font-size: 12px; white-space: nowrap; border-radius: 4px; color: #000; }
    .badges .badge img { max-width: 22px; }
    .badges .badge.ib { padding: 0; }
    .comment .commenter-name { font-size: 14px }
    .comment > .commenter-name { display: none; vertical-align: middle; color: #000 }
    @media(max-width: 500px) { .comment > .commenter-name { display: inline-block; margin-left: 5px; vertical-align: middle } }
    .comment > .commenter-name a { display: block; color: #000; text-decoration: none }
    .comment .commenter-name .website-url { color: #000; text-decoration: underline }
    .comment .commenter-name .label { font-size: 10px; text-transform: uppercase; font-weight: 500; color: #666666; } /* common label styling (unverified label, admin label, custom labels, etc) */
    .comment > .inner { position: relative; padding: 8px 8px 10px 8px; } /* relative is required for blocked message */
    @media(max-width: 500px) { .comment > .inner { padding: 5px 5px 5px 5px; } }
    .comment > .inner > .comment-content { position: relative; display: inline-block; width: calc(99% - 101px); margin-left: 15px; }
    .hide-avatars .comment > .inner > .comment-content { margin-left: 0; }
    .hide-avatars .comments > .comment > .inner > .comment-content > .commenter-name, .hide-avatars .comments > .comment > .inner > .comment-content > .comment-text { padding-left: 0; }
    @media(max-width: 500px) { .comment > .inner > .comment-content { display: inline; margin-left: 3px; background: transparent } }
    .comment > .inner > .comment-content .commenter-name { display: inline-block; max-width: 50%; vertical-align: middle; padding: 5px 0 0 2px; color: #171717 }
    .comment > .inner > .comment-content .commenter-name > .username { display: block; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
    @media(max-width: 500px) { .comment > .inner > .comment-content .commenter-name { padding: 5px 0 0 4px; } }
    .comment > .inner > .comment-content .comment-text { padding: 5px 2px; color: #000; line-height: 22px; font-size: 14px; word-break: break-word; white-space: pre-line; overflow-y: auto }
    .comment > .inner > .comment-content .comment-text ol, .comment > .inner > .comment-content .comment-text ul { white-space: normal; }
    .comment > .inner > .comment-content .comment-text .react { display: inline; max-height: 20px; margin: 0 3px; vertical-align: text-top; }
    .comment > .inner > .comment-content > .comment-text b > a { color: #000; text-decoration: none; }
    .comment > .inner > .comment-content > .comment-text blockquote { margin: 15px 0; padding: 0 20px; border-left: 1px solid #e5e5e5; }
    .comment > .inner > .comment-content .comment-text-edit { width: 100%; margin-top: 15px; }
    @media(max-width: 500px) { .comment > .children .comment-text { margin-left: 27px; } }
    .comment > .inner > .comment-content .comment-text br { line-height: 0.5em }
    .comment > .inner > .comment-content textarea.comment-text, .comment > .inner > .comment-content input.comment-text { display: block; width: calc(100% - 20px); height: fit-content; margin: 10px 10px 0 10px; padding: 5px 11px; resize: vertical }
    .comment > .inner > .comment-content .edit-failure { display: block; margin: 10px 0; text-align: center }
    .comment > .inner > .comment-content .comment-toolbar-vote { position: relative; margin-left: 8px }
    @media(max-width: 500px) { .comment > .inner > .comment-content .comment-toolbar-vote { margin-left: 0 } }
    .comment > .inner > .comment-content .comment-toolbar-vote .vote-awaiting-verification { padding: 5px 0; font-weight: 500 }
    .comment > .inner > .comment-bottom { margin-top: 25px; border-bottom: 1px solid #e5e5e5; }
    @media(max-width: 500px) { .comment > .inner > .comment-bottom { margin-top: 10px; } }
    .children .comment > .inner > .comment-bottom { margin-left: 28px; }
    @media(max-width: 500px) { .children .comment > .inner > .comment-bottom { margin-left: 21px; } }
    @media(min-width: 500px) { .hide-avatars .children .comment > .inner > .comment-bottom { margin-left: 33px; } }
    .comment > .inner > .comment-bottom > .comment-bottom-toolbar { position: relative; min-height: 36px; }
    .comment > .inner > .comment-bottom .comment-vote-options .votes-up, .comment > .inner > .comment-bottom .comment-vote-options .votes-down { position: relative; top: 1px; vertical-align: middle; font-size: 12px; font-weight: 500; }
    .comment > .inner > .comment-bottom .comment-vote-options .votes-up { margin-right: 5px; }
    .comment > .inner > .comment-bottom .comment-vote-options .votes-down { margin-left: 5px; }
    .comment > .inner > .comment-bottom .comment-toolbar-vote .comment-votes .divider { height: 20px; }
    .comment > .inner > .comment-bottom .comment-vote-options { display: inline-block; margin: 0 7px 0 2px; font-size: 12px; }
    .comment > .inner > .comment-bottom .comment-vote-options > span { cursor: pointer }
    .comment > .inner > .comment-bottom .comment-votes, .comment > .inner > .comment-bottom .comment-reply-start { display: inline-block; margin: 5px 2px; font-size: 12px }
    .comment > .inner > .comment-bottom .comment-vote-options button { margin: 0 3px }
    .comment > .inner > .comment-bottom .comment-vote-options .view-count { display: inline-flex; align-items: center; vertical-align: middle; gap: 3px; margin-left: 3px; color: #828282; }
    .comment > .inner > .comment-bottom .comment-vote-options .view-count .icon { opacity: 0.7; }
    .comment > .inner > .comment-bottom .comment-toolbar-reply { position: absolute; right: 0; top: -4px; }
    .comment > .inner > .comment-bottom .comment-reply-start { border: none; background: none; font-weight: 600; }
    .comment > .inner > .comment-bottom .comment-reply-start i { position: relative; top: -2px; pointer-events: none; }
    .comment > .inner > .comment-bottom .comment-vote-auth { width: 100%; max-width: 400px }
    .comment > .inner > .comment-bottom .comment-vote-auth .fast-comments-waiting { float: left }
    .comment > .inner > .comment-bottom .comment-vote-auth .buttons { text-align: right }
    .comment > .inner > .comment-bottom .comment-vote-auth button { margin: 5px 0 0 5px; padding: 10px 35px; background: #333; color: #fff; border: none; }
    .comment > .inner > .comment-bottom .reply-form-wrapper { padding: 5px }
    .comment > .toggle-replies { margin: 0 0 0 15px; line-height: 24px; font-weight: 500; font-size: 11px; color: #666; cursor: pointer; user-select: none; }
    .children .comment > .toggle-replies { margin-left: 41px; }
    @media(max-width: 500px) { .children .comment > .toggle-replies { margin-left: 12px; } }
    .comment > .toggle-replies > * { vertical-align: middle; pointer-events: none; }
    .comment > .toggle-replies > i { margin-right: 5px; }
    .comment > .toggle-replies > span > .count { color: #1f1f1f; }
    .comment > .toggle-replies > span > .count:before { content: "("; }
    .comment > .toggle-replies > span > .count:after { content: ")"; }
    .comment .prompt { position: absolute; top: -2px; left: 0; width: 100%; height: 100%; padding: 10px; box-sizing: border-box; background: rgba(255, 255, 255, 0.9); text-align: center } /* -2px to ensure covers up arrow */
    .comment .prompt p { font-weight: 500; }
    .comment .prompt button { user-select: none; }
    .comment .prompt button:not(:last-child) { margin-right: 10px }
    .comment .comment-error p:before { padding-right: 5px; content: "❗" }
    @media(max-width: 500px) { .comment .prompt { padding: 5px } }
    @media(max-width: 500px) { .comment .prompt p { margin: 0 0 .4em 0 } }
    .comment > .inner > .requires-verification-approval, .comment > .inner > .awaiting-approval-notice { margin: 15px 0; }
    .comment .top-right { position: absolute; top: 0; right: 0; z-index: 2; }
    .comment .top-right:hover { z-index: 9001; }
    .comment .jump-link { padding-right: 5px; vertical-align: baseline; font-size: 12px; text-decoration: none; color: #4f4f4f }
    .comment .jump-link .abs-date { margin-left: 5px; }
    @media(max-width: 500px) { .comment > .inner > .top-right { top: -10px; } } /* if top is too low, will go above highlighting for admin actions */
    .comment .top-right > * { display: inline-block; vertical-align: middle }
    .comment > .inner > .replied { display: inline-block; margin: -7px 5px 0 0; vertical-align: top; }
    .hide-avatars .comment > .inner > .replied { margin: 0 5px 0 0; }
    .children > .comment:not(:first-child) > .replied { opacity: 0.5; }
    .comment .menu { position: relative; padding: 10px 10px 10px 0; user-select: none }
    .comment .menu .menu-btn { cursor: pointer }
    .comment .menu .menu-btn i { display: inline-block; width: 4px; height: 4px; margin: 2px; background: #333; border-radius: 10px }
    .comment .menu.empty .menu-btn { cursor: default; opacity: 0.5; }
    .menu-content { position: absolute; width: 130px; min-width: max-content; padding: 20px; background-color: #fff; box-shadow: 2px 3px 6px rgba(0, 0, 0, 0.10); border-radius: 10px 0 10px 10px; z-index: 9001; }
    .menu-content div { padding: 3px; font-weight: 700; cursor: pointer; font-size: 13px }
    .menu-content div > * { vertical-align: middle; pointer-events: none; }
    .menu-content div > i { margin: 0 5px 0 0; }
    .menu-content div > span { display: inline-block; width: calc(100% - 29px); padding: 7px 10px; box-sizing: border-box; }
    .menu-content div:not(:last-child) > span { border-bottom: 1px solid #dcdcdc; }
    .menu-content.corner-bottom-right { border-radius: 10px 10px 0 10px; }
    @media(max-width: 500px) { .comment .menu { padding: 10px 5px 10px 0; } } /* if top is too low, will go above highlighting for admin actions */
    .comment > .children { margin: 15px 0 0 15px }
    .footer { height: 65px; margin-top: 25px; padding-top: 20px; text-align: center; font-size: 12px; } 
    .footer:not(.empty) { border-top: 1px solid #ccc } 
    .footer a, .footer .logo { vertical-align: top; text-decoration: none; color: #201600; font-weight: bold; font-size: 14px } 
    .footer .logo { margin-top: -2px; padding-right: 2px; } 
    .comment.readonly .comment-vote-options { display: none }
    .search-list { position: absolute; z-index: 4; width: 100%; margin-top: -9px; box-sizing: border-box; border-radius: 0 0 11px 11px; background: #fff; border: 1px solid #bfbfbf; }
    .search-list .cross { position: absolute; top: -11px; right: 0; width: 20px; height: 20px; background-color: #fff; border: 1px solid #bfbfbf; border-right: 0; border-radius: 16px 0 0 16px; cursor: pointer; }
    .search-list .search-entry { padding: 5px 10px; cursor: pointer; }
    .search-list .search-entry.last { border-radius: 0 0 11px 11px }
    .search-list .search-entry img { width: 20px; height: 20px; margin-right: 3px; vertical-align: middle; border-radius: 20px; }
    .search-list .search-entry > * { pointer-events: none; }
    .search-list .search-entry:hover, .search-list .search-entry.kb-select, .search-list .cross:hover { background-color: #eee; }
    .comment-input.search-list-open .reply-button-wrapper { display: none; }
    .avatar-wrapper .activity-icon { position: absolute; top: 4px; right: 4px; }
    .activity-icon { width: 8px; height: 8px; border-radius: 10px; }
    .username .activity-icon { position: relative; top: 2px; display: none; margin-right: 5px; }
    .activity-icon.online {  display: inline-block; background: lime; box-shadow: inset 0 2px 2px rgba(0, 0, 0, 0.2);  }
    .hide-avatars .activity-icon.online { top: -1px;  }
    @media(max-width: 500px) { .activity-icon { width: 5px; height: 5px;  }  }

The Recent Comments Widget displays a list of the most recent comments across your site or for a specific page. It includes a heading, rounded avatars, comment previews, clickable dates that deep-link to the comment, and automatic dark mode detection.

Basic Installation

Configuration Options

tenantId (required): Your FastComments tenant ID
urlId (optional): Filter to a single page. Leave null for all pages
count (optional): Number of comments to show. Default is 10
hasDarkBackground (optional): Force dark mode styling. Auto-detected from the page background if not set

The widget renders with the following HTML structure:

Default CSS Reference

Customization Examples

Change Avatar Size

Custom Avatar Size

Copy

.fc-rc2-avatar {
    width: 40px !important;
    height: 40px !important;
}

Show More Lines of Comment Text

Show More Comment Lines

Copy

.fc-rc2-body {
    -webkit-line-clamp: 5 !important;
}

Remove the Container Border

Remove Container Border

Copy

.fc-rc2 {
    border: none !important;
    box-shadow: none !important;
}

The Most Discussed Pages Widget displays a ranked list of your most commented pages. It includes a heading, numbered ranks, comment counts with icons, last activity dates, and automatic dark mode detection.

Basic Installation

Most Discussed Pages Widget Installation

Copy

Run

<script src="https://cdn.fastcomments.com/js/widget-top-pages-v2.min.js"></script>
<div id="fastcomments-widget-top-pages"></div>
<script>
    FastCommentsTopPagesV2(document.getElementById('fastcomments-widget-top-pages'), {
        tenantId: 'demo'
    });
</script>

Configuration Options

tenantId (required): Your FastComments tenant ID
hasDarkBackground (optional): Force dark mode styling. Auto-detected from the page background if not set

The widget renders with the following HTML structure:

Most Discussed Pages Widget HTML Structure

Copy

<div class="fc-tp2">
    <div class="fc-tp2-heading">Most Discussed Pages</div>
    <div class="fc-tp2-list">
        <div class="fc-tp2-item">
            <div class="fc-tp2-rank">1</div>
            <div class="fc-tp2-detail">
                <a class="fc-tp2-title" href="...">Page Title</a>
                <span class="fc-tp2-activity">Last activity Mar 21, 2026</span>
            </div>
            <div class="fc-tp2-count">42</div>
        </div>
    </div>
</div>

Default CSS Reference

Most Discussed Pages Widget Default CSS

Copy

.fc-tp2 {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, "Helvetica Neue", sans-serif;
    text-align: left;
    line-height: 1.5;
    color: #1a1a1a;
    border: 1px solid #e0e0e0;
    border-radius: 12px;
    padding: 20px;
    background: #fff;
}
.fc-tp2-heading { font-size: 16px; font-weight: 700; margin-bottom: 14px; padding-bottom: 12px; border-bottom: 1px solid #eee; }
.fc-tp2-item { display: flex; align-items: center; gap: 12px; padding: 10px 0; border-bottom: 1px solid #f0f0f0; }
.fc-tp2-item:last-child { border-bottom: none; }
.fc-tp2-rank { width: 26px; height: 26px; display: flex; align-items: center; justify-content: center; border-radius: 50%; font-size: 11px; font-weight: 700; background: #f0f0f0; color: #888; }
.fc-tp2-title { font-size: 13px; font-weight: 500; color: #1a1a1a; text-decoration: none; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.fc-tp2-activity { font-size: 11px; color: #999; }
.fc-tp2-count { font-size: 12px; font-weight: 600; color: #666; }

Customization Examples

Remove the Rank Badges

Remove Rank Badges

Copy

.fc-tp2-rank {
    display: none !important;
}

Remove the Container Border

Remove Container Border

Copy

.fc-tp2 {
    border: none !important;
    box-shadow: none !important;
}

The Recent Discussions Widget displays a list of pages sorted by the most recent comment activity. It includes a heading, last activity dates, comment counts with icons, and automatic dark mode detection.

Basic Installation

Recent Discussions Widget Installation

Copy

Run

<script src="https://cdn.fastcomments.com/js/widget-recent-discussions-v2.min.js"></script>
<div id="fastcomments-widget-recent-discussions"></div>
<script>
    FastCommentsRecentDiscussionsV2(document.getElementById('fastcomments-widget-recent-discussions'), {
        tenantId: 'demo'
    });
</script>

Configuration Options

tenantId (required): Your FastComments tenant ID
count (optional): Number of pages to show. Default is 20, max 100
hasDarkBackground (optional): Force dark mode styling. Auto-detected from the page background if not set

The widget renders with the following HTML structure:

Recent Discussions Widget HTML Structure

Copy

<div class="fc-rd2">
    <div class="fc-rd2-heading">Recent Discussions</div>
    <div class="fc-rd2-list">
        <div class="fc-rd2-item">
            <div class="fc-rd2-detail">
                <a class="fc-rd2-title" href="...">Page Title</a>
                <span class="fc-rd2-activity">Last activity Mar 21, 2026</span>
            </div>
            <div class="fc-rd2-count">42</div>
        </div>
    </div>
</div>

Default CSS Reference

Recent Discussions Widget Default CSS

Copy

.fc-rd2 {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, "Helvetica Neue", sans-serif;
    text-align: left;
    line-height: 1.5;
    color: #1a1a1a;
    border: 1px solid #e0e0e0;
    border-radius: 12px;
    padding: 20px;
    background: #fff;
}
.fc-rd2-heading { font-size: 16px; font-weight: 700; margin-bottom: 14px; padding-bottom: 12px; border-bottom: 1px solid #eee; }
.fc-rd2-item { display: flex; align-items: center; gap: 12px; padding: 10px 0; border-bottom: 1px solid #f0f0f0; }
.fc-rd2-item:last-child { border-bottom: none; }
.fc-rd2-title { font-size: 13px; font-weight: 500; color: #1a1a1a; text-decoration: none; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.fc-rd2-activity { font-size: 11px; color: #999; }
.fc-rd2-count { font-size: 12px; font-weight: 600; color: #666; }

Customization Examples

Remove the Container Border

Remove Container Border

Copy

.fc-rd2 {
    border: none !important;
    box-shadow: none !important;
}

Custom Link Color

Copy

a.fc-rd2-title:hover {
    color: #e63946 !important;
}

Other Frontend Libraries

All the official FastComments frontend libraries for React, Angular, Vue, and so on, accept the customCSS configuration parameter and are wrappers around the vanilla js library with the same HTML structure.

Getting Started

Widget Styling

Other Frontend Libraries

Custom Styling Guide

How to Override Styles

How to Customize Styles

How to Customize Comment Widget Styles

Option 1: Via customCSS Parameter

Option 2: Via Admin Dashboard

Tips

Comment Widget Styling Reference (v2, latest)

Recent Comments Widget Styling

Basic Installation

Configuration Options

Widget Structure

Default CSS Reference

Customization Examples

Change Avatar Size

Show More Lines of Comment Text

Remove the Container Border

Most Discussed Pages Widget Styling

Basic Installation

Configuration Options

Widget Structure

Default CSS Reference

Customization Examples

Remove the Rank Badges

Remove the Container Border

Recent Discussions Widget Styling

Basic Installation

Configuration Options

Widget Structure

Default CSS Reference

Customization Examples

Remove the Container Border

Custom Link Color

Other Frontend Libraries

Language 🇺🇸 English (US)

Getting Started

Widget Styling

Other Frontend Libraries

Custom Styling Guide

How to Override Styles

How to Customize Styles

How to Customize Comment Widget Styles

Option 1: Via customCSS Parameter

Option 2: Via Admin Dashboard

Tips

Comment Widget Styling Reference (v2, latest)

Recent Comments Widget Styling

Basic Installation

Configuration Options

Widget Structure

Default CSS Reference

Customization Examples

Change Avatar Size

Show More Lines of Comment Text

Remove the Container Border

Most Discussed Pages Widget Styling

Basic Installation

Configuration Options

Widget Structure

Default CSS Reference

Customization Examples

Remove the Rank Badges

Remove the Container Border

Recent Discussions Widget Styling

Basic Installation

Configuration Options

Widget Structure

Default CSS Reference

Customization Examples

Remove the Container Border

Custom Link Color

Other Frontend Libraries