return-youtube-dislike/Extensions/chrome/content-style.css

#return-youtube-dislike-bar-container {
  background: #c6c6c6;
}

#return-youtube-dislike-bar {
  background: #5094c8;
}

[dark] #return-youtube-dislike-bar-container {
}

[dark] #return-youtube-dislike-bar {
  background: #3ea6ff;
}