JSFiddle - React, Tailwind, and code Playground

HTML

<div id='container'>
    <div class='red'></div>
</div>

CSS

#container{
    height:200px;
    width:200px;
    position:absolute;
    left:0;
    right:0;
    margin-left:auto;
    margin-right:auto;
}
.red {
    height:200px;
    width:200px;
    background-color:red;
}