BetterYTM-Mirror/src/features/volume.css

/* #region volume slider */

.bytm-vol-slider-cont {
  position: relative;
}

.bytm-vol-slider-label {
  --bytm-slider-label-bg-col: var(
    --ytmusic-player-bar-background,
    var(--bytm-themed-bg)
  );
  position: absolute;
  top: 50%;
  left: 0;
  transform: translate(calc(-50% - 11px), -50%);
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: 5px;
  background-color: var(--bytm-slider-label-bg-col);
  background: linear-gradient(
    90deg,
    rgba(0, 0, 0, 0) 0%,
    var(--bytm-slider-label-bg-col) 20%
  );
  font-size: 1.4rem;
  text-align: right;
  padding: 15px;
  padding-right: 5px;
  opacity: 0.000001;
  transition: opacity 0.2s ease;
}

.bytm-vol-slider-label.has-icon {
  transform: translate(calc(-50% - 25px), -50%);
}

.bytm-vol-slider-label svg {
  padding: 4px;
}

.bytm-vol-slider-label svg path {
  fill: #909090;
}

.bytm-vol-slider-label.bytm-visible {
  opacity: 1;
}

:root
  body.bytm-dom-ytm
  ytmusic-app-layout[player-ui-state="FULLSCREEN"]
  .bytm-vol-slider-label {
  color: #fff;
}

.bytm-vol-slider-shared {
  display: flex;
  flex-direction: row;
  align-items: center;
}

.bytm-vol-slider-shared svg {
  width: 20px;
  height: 20px;
}