JSFiddle - React, Tailwind, and code Playground

HTML

<body>
    <div id="my-div"></div>
</body>

CSS

#my-div {               
    position: absolute;
    height: 100px;
    width: 100px;    
    left: 50%;
    top: 50%;
    background: red;
    transform: translate(-50%, -50%);    
    -webkit-transform: translate(-50%, -50%);
    -moz-transform: translate(-50%, -50%);
    -ms-transform: translate(-50%, -50%);
}