JSFiddle - React, Tailwind, and code Playground

HTML

<div></div>

CSS

div { 
    border-radius:50%; 
    width: 100px; 
    height:100px; 
    background:red; 
    
    top:50%;
    left:50%; 
    position:absolute; 
    
    margin-left:-50px;
    margin-top:-50px;
}