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Customizing Styles with CSS

You can add your own stylesheet in Admin > Configure > Advanced > Custom CSS.

Use CSS Variables

We recommend using CSS Variables to broadly apply changes to certain styling aspects like color or fonts.

Here is a CSS example that modifies some of the CSS Variables.

:root {
  /* Change primary font */
  --font-family-primary: 'Verdana';

  /* Remove round corners */
  --round-corners: 0px;

You can find all CSS Variables using the Web Inspector or navigate to for a comprehensive list and additional information.

NOTE: Before 6.3.0 Coral uses a different set of CSS Variables. Navigate to the link above to get information on upgrading.

Use stable CSS Class Names

If you would like to change the styling of any elements of the comment embed, we provide global classnames. Most elements will be tagged with either .coral or .coral-stream.

The easiest way to find the classname for the element you’re looking for is to use the web inspector, and then update your stylesheet accordingly.

You can also navigate to to see available stable class names.

Custom body class for theming

You can set the class name of the <body> tag inside the embed by using the bodyClassName parameter when calling Coral.createStreamEmbed:

  bodyClassName: "pink"

This will allow your styles to include variations:

.pink button.coral {
  background: pink;

Reaction styling

As of Coral 6.3.0, Coral has support for styling based on the number of reactions that a given comment has received. It does so via the:

.coral-reacted-{{ n }}

Where {{ n }} is the number of reactions the comment has received. You can invert this when creating CSS to allow you to highlight comments that have at least {{ n }} reactions. For example, if you wanted to add a coral color to comments with at least 3 reactions, you could write:

.coral-comment .coral-indent {
  background-color: coral;

.coral-reacted-0 .coral-indent,
.coral-reacted-1 .coral-indent,
.coral-reacted-2 .coral-indent {
  background-color: transparent;