discourse/app/assets/stylesheets/common/select-kit/select-kit.scss

.mobile-view .select-kit.is-expanded {
  z-index: z("dropdown");
}

.select-kit {
  border: none;
  min-width: 220px;
  box-sizing: border-box;
  display: inline-block;
  flex-direction: column;
  position: relative;
  vertical-align: middle;
  user-select: none;

  &.is-hidden {
    display: none;
  }

  &.is-disabled {
    pointer-events: none;
  }

  &.is-expanded {
    z-index: z("dropdown");

    .select-kit-body {
      -webkit-animation: fadein 0.25s;
      animation: fadein 0.25s;
      display: flex;
      flex-direction: column;
      left: 0;
      position: absolute;
      top: 0;
    }

    .select-kit-collection {
      border-radius: inherit;
    }
  }

  &.is-above {
    .select-kit-body {
      bottom: 0;
      top: auto;
    }

    .select-kit-filter {
      border-top: 0;
    }

    .select-kit-wrapper {
      bottom: 0;
      top: auto;
    }
  }

  .d-icon {
    opacity: 0.7;
  }

  .select-kit-header {
    box-sizing: border-box;
    overflow: hidden;
    transition: all 0.25s;
    cursor: pointer;
    outline: none;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-direction: row;
    min-height: 30px;

    .selected-name {
      text-align: left;
      flex: 0 1 auto;
      padding: 1px 0;
      text-overflow: ellipsis;
      white-space: nowrap;
      overflow: hidden;
      color: inherit;
    }

    .btn-clear {
      padding: 0 10px;
      border: 0;
      background: none;
    }

    .icon {
      margin-right: 5px;
    }

    .caret-icon {
      margin-left: 5px;
      pointer-events: none;
    }

    .d-button-label {
      display: flex;
      align-items: center;
      white-space: nowrap;
      overflow: hidden;
      line-height: $line-height-medium;

      .d-icon {
        margin-left: 5px;
        margin-right: 0;
      }
    }
  }

  .select-kit-body {
    display: none;
    background: $secondary;
    box-sizing: border-box;
  }

  .select-kit-row {
    cursor: pointer;
    line-height: $line-height-medium;
    outline: none;
    display: flex;
    flex: 1 0 auto;
    box-sizing: border-box;
    align-items: center;
    justify-content: flex-start;

    .name {
      margin: 0;
      overflow: hidden;
      text-overflow: ellipsis;
      flex: 1 1 0%;
    }

    .d-icon {
      margin-right: 5px;
    }

    &.is-highlighted {
      background: $tertiary-low;
    }

    &.is-selected {
      background: $highlight-medium;
    }

    &.is-selected.is-highlighted {
      background: $tertiary-low;
    }

    .discourse-tag,
    .discourse-tag-count {
      color: $primary;
    }
  }

  .select-kit-collection {
    background: $secondary;
    overflow-x: hidden;
    overflow-y: auto;
    border-radius: inherit;
    -webkit-overflow-scrolling: touch;
    margin: 0;
    padding: 0;
    max-height: 200px;

    .validation-message {
      white-space: nowrap;
      color: $danger;
      flex: 1 0 auto;
      margin: 5px;
      padding: 0 2px;
    }

    .select-kit-collection {
      padding: 0;
      margin: 0;

      &:hover .select-kit-row.is-highlighted:hover {
        background: $tertiary-low;
      }
    }

    &::-webkit-scrollbar {
      -webkit-appearance: none;
      width: 10px;
    }

    &::-webkit-scrollbar-thumb {
      cursor: pointer;
      border-radius: 5px;
      background: dark-light-choose($primary-medium, $secondary-medium);
    }

    &::-webkit-scrollbar-track {
      background: transparent;
      border-radius: 0;
    }
  }

  .select-kit-filter {
    display: flex;
    box-sizing: border-box;
    align-items: center;
    justify-content: space-between;

    .filter-input,
    .filter-input:focus,
    .filter-input:active {
      background: none;
      margin: 0;
      padding: 0;
      flex: 1 0 0px;
      outline: none;
      border: 0;
      border-radius: 0;
      box-shadow: none;
      width: 100%;
    }

    &.is-hidden {
      width: 1px;
      height: 1px;
      border: 0;
      margin: -1px;
      padding: 0;
      overflow: hidden;
      position: fixed;
      outline: 0;
      left: 0;
      top: 0;
    }
  }

  .select-kit-wrapper {
    position: absolute;
    top: 0;
    left: 0;
    background: none;
    display: none;
    box-sizing: border-box;
    pointer-events: none;
  }
}