BetterYTM-Mirror/assets/style/fixHDR.css

#side-panel ytmusic-player-queue-item[play-button-state="loading"],
#side-panel ytmusic-player-queue-item[play-button-state="playing"],
#side-panel ytmusic-player-queue-item[play-button-state="paused"] {
  background-color: #1D1D1D !important;
}