JSFiddle - React, Tailwind, and code Playground

HTML

<div id="content">
    Content goes here
</div>

CSS

html, body {
    margin: 0;
    padding: 0;
    width: 100%;
    height: 100%;
}
#content {
    width: 100px;
    height: 100px;
    background-color: red;
    text-align: center;
    vertical-align: middle;
    position: absolute;
    top: 50%;
    margin-top: -50px;
    left: 50%;
    margin-left: -50px;
}