JSFiddle - React, Tailwind, and code Playground

HTML

<script src="//cdnjs.cloudflare.com/ajax/libs/less.js/1.7.3/less.min.js"></script>
<div id="exampleSquare"></div>

CSS

#exampleSquare {
    position: absolute;
    height: 100px;
    width: 100px;
    background-color: gray;
    left: calc(~"`$(window).width()` / 2 - 50px");
}