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

.select-box-kit {
  &.dropdown-select-box {
    display: -webkit-inline-box;
    display: -ms-inline-flexbox;
    display: inline-flex;
    min-width: auto;

    &.is-expanded {
      .select-box-kit-collection,
      .select-box-kit-body {
        border-radius: 0;
      }
    }

    .select-box-kit-body {
      border: 1px solid dark-light-diff($primary, $secondary, 90%, -60%);
      background-clip: padding-box;
      -webkit-box-shadow: 0 1px 5px rgba(0,0,0,0.4);
              box-shadow: 0 1px 5px rgba(0,0,0,0.4);
      max-width: 300px;
      width: 300px;
    }

    .select-box-kit-row {
      margin: 0;
      padding: 10px 5px;

      .icons {
        display: -webkit-box;
        display: -ms-flexbox;
        display: flex;
        -webkit-box-align: start;
            -ms-flex-align: start;
                align-items: flex-start;
        -webkit-box-pack: center;
            -ms-flex-pack: center;
                justify-content: center;
        -ms-flex-item-align: start;
            align-self: flex-start;
        margin-right: 10px;
        margin-top: 2px;
        width: 30px;

        .d-icon {
          font-size: 1.286em;
          -ms-flex-item-align: center;
              align-self: center;
          margin-right: 0;
          opacity: 1;
          color: dark-light-choose(scale-color($primary, $lightness: 40%), scale-color($secondary, $lightness: 60%));
        }
      }

      .texts {
        line-height: 18px;
        -webkit-box-flex: 1;
            -ms-flex: 1;
                flex: 1;
        -webkit-box-align: start;
            -ms-flex-align: start;
                align-items: flex-start;
        display: -webkit-box;
        display: -ms-flexbox;
        display: flex;
        -ms-flex-wrap: wrap;
            flex-wrap: wrap;
        -webkit-box-orient: vertical;
        -webkit-box-direction: normal;
            -ms-flex-direction: column;
                flex-direction: column;

        .name {
          -webkit-box-flex: 1;
              -ms-flex: 1;
                  flex: 1;
          font-weight: bold;
          font-size: 1em;
          color: $primary;
          padding: 0;
        }

        .desc {
          -webkit-box-flex: 1;
              -ms-flex: 1;
                  flex: 1;
          font-size: 0.857em;
          font-weight: normal;
          color: dark-light-choose(scale-color($primary, $lightness: 50%), scale-color($secondary, $lightness: 40%));;
          white-space: normal;
        }
      }

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

      &:hover {
        background: $highlight-medium;
      }
    }

    .select-box-kit-collection {
      padding: 0;
    }

    .dropdown-select-box-header {
      -webkit-box-sizing: border-box;
         -moz-box-sizing: border-box;
              box-sizing: border-box;
      padding: 0;
      border: 0;
      outline: 0;
      -webkit-box-pack: start;
          -ms-flex-pack: start;
              justify-content: flex-start;
      background: none;
      height: 30px;

      &.is-focused {
        .btn {
          border: 1px solid $tertiary;
          -webkit-box-shadow: $tertiary 0px 0px 6px 0px;
                  box-shadow: $tertiary 0px 0px 6px 0px;
        }
      }

      .d-icon + .d-icon {
        margin-left: 5px;
        font-size: 1.143em;
        line-height: 18px;
      }

      .btn {
        -webkit-box-align: center;
            -ms-flex-align: center;
                align-items: center;
        -webkit-box-pack: justify;
            -ms-flex-pack: justify;
                justify-content: space-between;
        -webkit-box-orient: horizontal;
        -webkit-box-direction: normal;
            -ms-flex-direction: row;
                flex-direction: row;
        display: -webkit-inline-box;
        display: -ms-inline-flexbox;
        display: inline-flex;
        height: 100%;
        margin: 0;
        border: 1px solid transparent
      }
    }
  }
}