JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://cdnjs.cloudflare.com/ajax/libs/select2/3.2/select2.min.js"></script>
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/select2/3.2/select2.css">
<select class="parent_filter_select2 pull-right" id="parent_filter_select2" multiple="multiple" name="select_project" style="width: 300px;">
<option value="all">All</option>
        <option value="Option A">Option A</option>
        <option value="Option B">Option B</option>
        <option value="Option C">Option C</option>
        <option value="Option D">Option D</option>
</select>

JavaScript

$('#parent_filter_select2').select2({
    placeholder: 'Select'
});