discourse/app/assets/stylesheets/common/components/widget-dropdown.scss

.widget-dropdown {
  margin: 1em;
  display: inline-flex;
  box-sizing: border-box;

  &.closed {
    .widget-dropdown-body {
      display: none;
    }
  }

  .widget-dropdown-body {
    display: flex;
    flex-direction: column;
    padding: 0.25em;
    background: $secondary;
    margin-top: 5px;
    z-index: z("dropdown");
    border: 1px solid $primary-low;
    max-height: 250px;
    overflow-y: auto;
    overflow-x: hidden;
  }

  .widget-dropdown-item {
    cursor: pointer;
    padding: 0.25em;
    display: flex;
    flex: 1;
    align-items: center;

    .d-icon {
      color: $primary-medium;
      margin-right: 0.25em;
    }

    &.separator {
      padding: 0;
      background: $primary-low;
      margin: 0.25em 0;

      &:hover {
        background: $primary-low;
      }
    }

    &:hover {
      background: $tertiary-low;
    }
  }

  .widget-dropdown-header {
    cursor: pointer;
  }
}