JSFiddle - React, Tailwind, and code Playground

HTML

<p></p>
<span id="pointer"></div>

CSS

body {background:#ff004e;padding:40px}

p {background:white; -webkit-border-radius: 10px;
-moz-border-radius: 10px;
border-radius: 10px; width:250px; height:150px}

span#pointer{border:solid 10px transparent;border-right-color:#fff;position:absolute;margin:-85px 0 0 -20px;}