JSFiddle - React, Tailwind, and code Playground

HTML

<body>
        <div class="center">
    
        </div>
    </body>

CSS

body,html{
    width: 100%;
    height: 100%;
    overflow:hidden;
    position: relative
}
.center{
    position: absolute;
    left: 50%;
    top: 50%;
    width: 200px;
    height: 200px;
    background: #ddd
}