JSFiddle - React, Tailwind, and code Playground

HTML

<div>HELLO</div>

CSS

div {
    position: relative;
    display: inline-block;
    padding: 0 10px;
    margin: 10px;
}

div:after {
    content: "";
    position: absolute;
    border: 2px solid #000;
    top: 50%;
    margin-top: -1px;
    width: 100%;
    left: -2px;
}