CODE EXAMPLE FOR CSS

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/* ==UserStyle==
@name         Example UserCSS style
@namespace    github.com/openstyles/stylus
@version      1.0.0
@license      unlicense
@preprocessor default
@var color link-color "Link Color" red
==/UserStyle== */

@-moz-document domain("example.com") {
  a {
    color: var(--link-color);
  }
}