JSFiddle - React, Tailwind, and code Playground

HTML

<div id="container">
    <div id="element">
    </div>
</div>

CSS

#container {
    display: inline-block;
    position: relative;
    width: 25%;
}
#container:after {
    content: '';
    display: block;
    margin-top: 100%;
}
#element {
    position: absolute;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
    background-color: dodgerblue;
}