JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="http://code.jquery.com/ui/jquery-ui-git.css">
<script src="http://code.jquery.com/ui/jquery-ui-git.js"></script>
<select id="test">
    <optgroup label="Some label">
        <option value="1">One</option>
    </optgroup>
    <option value="2">Two</option>
</select>
<div contenteditable="true">
    <p>Testing...</p>
</div>

CSS

div {
    width:100%;
    height:200px;
    outline:1px dotted #000;
    margin-top:4em;
}

JavaScript

$('#test').selectmenu();