JSFiddle - React, Tailwind, and code Playground
HTML
<div id="container">
<div id="foo"></div>
<button>slideToggle()</button>
</div>
CSS
#container { width: 200px; height: 200px; margin: 100px auto; border: 1px solid #00f; position: relative; }
#foo { position: relative; top: -3px; border: 1px solid #f00; width: 50px; height: 50px; }
button { position: absolute; bottom: 0; right: 0 }
JavaScript
$('button').on("click",function() { $('#foo').slideToggle() });