JSFiddle - React, Tailwind, and code Playground

by unimous

HTML

<div id="d1">
    <div id="d2">
</div>
</div>

CSS

#d1 {
    height: 3000px;
    background-color: red;
}

#d2 {
    background-color: green;
    height: 40px;
    width: 40px;
    position: absolute;
    bottom: 0px;
}