JSFiddle - React, Tailwind, and code Playground

HTML

<div id="Accueil">
    <h1><span>- Développement web - Sécurité informatique -</span></h1>
</div>

CSS

#Accueil h1 {
    display: table;
    width: 100%;
    height: 300px;
    margin: 100px auto 0;
    border: 2px solid red;
    text-align: center;
    text-transform: uppercase;
    font: 20px/50px sans-serif;
}

#Accueil h1 span {
    display: table-cell;
    vertical-align: middle;
}