JSFiddle - React, Tailwind, and code Playground

HTML

<div class="parent">
    parent
    <div class="child">
        <br>child
    </div>
</div>

CSS

div{position:relative;padding:5px;}
.parent{border:1px solid #0b0;}
.child{border:1px solid #00b;position:absolute;top:0px;}