单击时指定Select2多选时的边框颜色

我想在单击时更改select2的边框颜色(onfocus)。

我试过这样做，但它改变了选定内容的边框颜色，如下所示。如何指定边框颜色？

$('.sf-multi-select').select2({
  placeholder: 'Select or type to search',
  closeOnSelect: false,
});

.select2-search__field:focus {
  border: 1px solid #43AEA8 !important;
}

.sf-multi-select:focus {
  border: 1px solid #43AEA8 !important;
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.js"></script>
<link href="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.6-rc.0/css/select2.min.css" rel="stylesheet" />
<script src="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.6-rc.0/js/select2.min.js"></script>


<select class="sf-multi-select" placeholder="Type to search" multiple="multiple">
  <option value="17">Choce 1</option>

  <option value="16">Choice 2</option>

</select>

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