select2 add
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<link href="https://cdn.jsdelivr.net/npm/select2@4.1.0-rc.0/dist/css/select2.min.css" rel="stylesheet" />
<script src="https://cdn.jsdelivr.net/npm/select2@4.1.0-rc.0/dist/js/select2.min.js"></script>
<select class="js-example-basic-single" name="state">
<option value="AL">Alabama</option>
...
<option value="WY">Wyoming</option>
</select>
$(document).ready(function() {
$('.js-example-basic-single').select2();
});