JSFiddle - React, Tailwind, and code Playground

HTML

<div id="box">Hello World</div>

CSS

#box {
    height:50px;
    width:50px;
    color:#000;
    background-color:rgba(0,0,0,0.3);
    text-align:center;
    margin:30px auto;
    font-family:arial,sans-serif;
    padding:30px;
}