This stylesheet allows you to use ng-select in clarity

clarity-ng-select.scss

/**
Clarity (http://clarity.design) (at the moment of writing) does not have an auto-complete/combobox component.
ng-select is currently one of the more popular angular2/4 packages for adding auto-complete components to an angular project.

This style sheet allows anyone to use ng-select in a angular+clarity project that uses clarity forms.
To get these styles applied to your ng-select component, declare your form component as follows:

<form clrForm>
  <clr-input-container>
    <label>Foo</label>
    <ng-select clrInput [items]="exampleItems"></ng-select>
  </clr-input-container>
</form>
 */

$ng-select-highlight: #3f51b5 !default;
$ng-select-primary-text: rgba(black, 0.87) !default;
$ng-select-primary-light-text: rgba(white, 0.87) !default;
$ng-select-secondary-text: rgba(black, 0.54) !default;
$ng-select-secondary-light-text: rgba(white, 0.54) !default;
$ng-select-disabled-text: rgba(black, 0.38) !default;
$ng-select-divider: rgba(black, 0.12) !default;
$ng-select-bg: #ffffff !default;
$dark-theme-highlight-color: #324f61;

.ng-select {
  ng-select {
    padding: 0;
    height: auto;
    max-height: none;
  }
  .clr-input-wrapper {
    max-height: none;
    clr-icon {
      position: absolute;
      right: -8px;
      top: 0;
    }
  }
  .ng-value-container {
    .ng-value {
      border-radius: 10px;
      padding: 0 4px;
      margin: 1px 2px;
      line-height: 22px;
      max-height: 22px;
    }
    .ng-value-icon {
      margin-right: 4px;
      margin-left: 8px;
      &:first-of-type {
        margin-left: 0;
      }
      display: inline-block;
    }
  }
  .ng-select-multiple {
    .ng-value-container {
      .ng-value {
        color: $ng-select-primary-light-text;
        background: $ng-select-highlight;
        padding: 0 8px;
      }
    }
    .ng-input {
      input {
        padding: 0 0 0 4px;
      }
    }
  }
  .ng-clear-wrapper {
    text-align: center;
    margin-top: 2px;
  }
}

.dark-theme {
  .ng-select {
    input, .ng-value, .ng-clear-wrapper {
      color: $ng-select-primary-light-text;
    }
  }
  .ng-select-multiple {
    .ng-value-container {
      .ng-value {
        background: $dark-theme-highlight-color;
      }
    }
  }
}

.ng-dropdown-panel {
  background: $ng-select-bg;
  left: 0;
  &.ng-select-bottom {
    top: calc(100%);
    box-shadow: 0 5px 5px -3px rgba(0, 0, 0, .2), 0 8px 10px 1px rgba(0, 0, 0, .14), 0 3px 14px 2px $ng-select-divider;
  }
  &.ng-select-top {
    bottom: calc(100% - .84375em);
    box-shadow: 0 -5px 5px -3px rgba(0, 0, 0, .2), 0 -8px 10px 1px rgba(0, 0, 0, .14), 0 -3px 14px 2px $ng-select-divider;
  }
  &.multiple {
    .ng-option {
      &.selected {
        background: $ng-select-bg;
      }
      &.marked {
        background: rgba(0, 0, 0, .04);
      }
    }
  }
  .ng-dropdown-header {
    border-bottom: 1px solid $ng-select-divider;
    padding: 0 16px;
    line-height: 3em;
    min-height: 3em;
  }
  .ng-dropdown-footer {
    border-top: 1px solid $ng-select-divider;
    padding: 0 16px;
    line-height: 3em;
    min-height: 3em;
  }
  .ng-dropdown-panel-items {
    .ng-optgroup {
      user-select: none;
      cursor: pointer;
      line-height: 3em;
      height: 3em;
      padding: 0 16px;
      color: $ng-select-secondary-text;
      font-weight: 500;
      &.ng-option-marked {
        background: rgba(0, 0, 0, .04);
      }
      &.ng-option-disabled {
        cursor: default;
      }
      &.ng-option-selected {
        background: $ng-select-divider;
        color: $ng-select-highlight;
      }
    }
    .ng-option {
      line-height: 3em;
      min-height: 3em;
      white-space: nowrap;
      overflow: hidden;
      text-overflow: ellipsis;
      padding: 0 16px;
      text-decoration: none;
      position: relative;
      color: $ng-select-primary-text;
      text-align: left;
      &.ng-option-marked {
        background: rgba(0, 0, 0, .04);
        color: $ng-select-primary-text;
      }
      &.ng-option-selected {
        background: $ng-select-divider;
        color: $ng-select-highlight;
      }
      &.ng-option-disabled {
        color: $ng-select-disabled-text;
      }
      &.ng-option-child {
        padding-left: 32px;
      }
      .ng-tag-label {
        padding-right: 5px;
        font-size: 80%;
        font-weight: 400;
        color: $ng-select-disabled-text;
      }
    }
  }
}

This no longer works with ng-select 2.20.5. Trying to use this inside a modal so that may be the reason, but the dropdown container isn't visible.