one-dark/cinnamon/sass/ui/sound.scss

///
// Sound Applet (status/volume.js)
//
.sound-button {
  width: 22px;
  height: 13px;
  padding: 8px;

  @extend %button;

  &-container {
    padding-right: 3px;
    padding-left: 3px;
  }
  StIcon {
    icon-size: 1.4em;
  }
}

.sound-track {
  &-infos {
    padding: 5px;
  }
  &-info {
    padding-top: 2px;
    padding-bottom: 2px;

    StIcon {
      icon-size: 16px;
    }

    StLabel {
      padding-left: 5px;
      padding-right: 5px;
    }
  }
  &-box {
    padding-left: 15px;
    padding-right: 15px;
    max-width: 220px;
  }
}

.sound-seek-box {
  padding-left: 15px;

  StLabel {
    padding-top: 2px;
  }
  StIcon {
    icon-size: 16px;
  }
}

.sound-seek-slider {
  width: 140px;
}

.sound-volume-menu-item {
  padding: 0.4em 1.75em;

  StIcon {
    icon-size: 1.14em;
    padding-left: 8px;
    padding-right: 8px;
  }
}

.sound-playback-control {
  padding: 5px 10px 10px 10px;
}

// 2.8
.sound-player {
  // padding: 0 4px;

  > StBoxLayout:first-child {
    padding: 5px 10px 12px 10px;
    spacing: 0.5em;

    StButton:small {
      width: 20px;
      height: 20px;
      border: 1px solid transparent;

      StIcon {
        icon-size: 12px;
      }

      &:hover {
        @include button(hover);
      }
      &:active {
        @include button(active);
      }
    }
  }

  &-generic-coverart {
    background: rgba(0, 0, 0, 0.2);
  }

  &-overlay {
    width: 290px;
    height: 70px;
    padding: 15px;
    spacing: 0.5em;
    background: transparentize($bg_color, 0.1);
    border-top: 1px solid $borders_color;
    // background: transparentize(darken($osd_bg_color, 5%), 0.1);
    // border: 0px solid darken($osd_bg_color, 10%);
    // border-bottom: 1px ;
    color: $fg_color;

    StButton {
      width: 22px;
      height: 13px;
      padding: 5px;
      color: $fg_color;
      border-radius: 2px;
      border: 1px solid transparent;

      StIcon {
        icon-size: 16px;
      }

      &:hover {
        @include button(hover);
      }
      &:active {
        @include button(active);
      }
    }

    StBoxLayout {
      padding-top: 2px;
    }

    > StBoxLayout {
      spacing: 5px;
    }
  }

  .slider {
    height: 0.5em;
    padding: 0;
    border: none;
    -slider-height: 0.5em;
    -slider-background-color: if($variant == 'light', $button_border, darken($bg_color, 5%));
    -slider-border-color: rgba(0, 0, 0, 0);
    -slider-active-background-color: $selected_bg_color;
    -slider-active-border-color: rgba(0, 0, 0, 0);
    -slider-border-width: 0px;
    -slider-handle-radius: 0px;
  }
}