JSFiddle - React, Tailwind, and code Playground

HTML

<h1>Meine Ăśberschrift</h1>

CSS

h1::before {
    display: inline-block;
    height: 0.4em;
    width: 5em;
    border-top: 1px solid black;
    content: '';
}

h1::after {
    display: inline-block;
    height: 0.4em;
    width: 5em;
    border-top: 1px solid black;
    content: '';
}