app/assets/stylesheets/components/ref_selector.scss


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.ref-selector {
  & &-dropdown-content {
    // Setting a max height is necessary to allow the dropdown's content
    // to control where and how scrollbars appear.
    // This content is limited to the max-height of the dropdown
    // ($dropdown-max-height-lg) minus the additional padding
    // on the top and bottom (2 * $gl-padding-8)
    max-height: $dropdown-max-height-lg - 2 * $gl-padding-8;
  }

  .dropdown-menu.show {
    // Make the dropdown a little wider and longer than usual
    // since it contains quite a bit of content.
    width: 20rem;
    max-height: $dropdown-max-height-lg;
  }
}