JSFiddle - React, Tailwind, and code Playground

HTML

<h1>test</h1>

CSS

h1 {
    background:#fff;
    width:50px;
    position:relative;
    text-align:center;
    margin:0 auto
}
h1:before {
    content:'';
    z-index:-1;
    background:red;
    position:absolute;
    margin:0 auto;
    left:-75px;
    top:10px;
    width:200px;
    height:3px;
}