message: Move tooltip background color out into a Sass variable.
diff: $ribbon-width: 5px;
  $arrow-size: 16px; // ensure this stays in sync with 'popperArrowSize' in 'usePopper.ts'
  $minimal-arrow-size: 10px;
  +$background-color: #151523;
  $border-color: #5d5970;
  $horizontal-padding: 11px;
  @@ -17,7 +18,7 @@ $horizontal-padding: 11px;
  --ribbon-color: #8e8e9e;
  position: absolute;
  - background-color: #151523;
  + background-color: $background-color;
  color: #dadaea;
  width: fit-content;
  max-width: 306px;
  @@ -158,6 +159,6 @@ $horizontal-padding: 11px;
  &:not(:empty) {
  color: color.mix(white, $color, 80%);
  background-color: rgba($color, 0.175);
  - border-top-color: #151523;
  + border-top-color: $background-color;
  }
  }
  