JSFiddle - React, Tailwind, and code Playground

HTML

<div class="notrelative">
    Relative Container
    <div class="absolute"></div>
</div>

<!-- This is what we wanted -->

CSS

div.notrelative {
    height: 100px;
    width: 100px;
    background: #eaf;
    margin: 50px;
    font-size: 9px;
    font-family: Arial;
    position: relative;
}

div.absolute {
    height: 20px;
    width: 20px;
    position: absolute;
    background: #eea;
    margin-bottom: 10px;
    top: 0;
    left: 0;
}