MediaWiki:Citizen.css

/* All CSS here will be loaded for users of the Citizen skin */

.skin-citizen-dark .wikiEditor-ui {
  background-color: #ffffff02;
}

.skin-citizen-light .wikiEditor-ui {
  background-color: #00000005;
}

.skin-citizen-light .timeline-header hr {
  background-color: #000000;
  border: 1px solid #000000;
}

.skin-citizen-dark .timeline-header hr {
  background-color: #ffffff;
  border: 1px solid #ffffff;
}