JSFiddle - React, Tailwind, and code Playground

HTML

<div class="cn">
    <div class="inner">
        test
    </div>
</div>

CSS

div.cn {
    position: relative;
    width: 200px;
    height: 200px;
    background: gray;    
}

div.inner {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 10px;
    height: 10px;
    -webkit-transform: translate(-50%, -50%);  
    transform: translate(-50%, -50%);   
    background: red;
}