JSFiddle - React, Tailwind, and code Playground

HTML

<div id="f">World </div>

CSS

#f:before{    
    background: yellowgreen;
    content: "Hello ";
}
#f{
    width: 200px;
    height: 200px;
    background: gold;
    margin: 100px;
    padding: 100px;
}
#f:after{    
    background: burlywood;
    content: "StackOverflow";
}