JSFiddle - React, Tailwind, and code Playground
HTML
<div id="outer" style="width: 400px; height: 400px; border: 1px solid red; position: relative">
<div id="inner" style="width: 200px; height: 200px; border: 2px solid yellow; right:0;bottom:0;position:absolute;">
</div>
</div>