JSFiddle - React, Tailwind, and code Playground

HTML

<section class="container">
    <div class="center">
        <div class="content">
            <h1>Helllo Center Text</h1>
        </div>
    </div>
</section>

CSS

.container{width:100%; height:500px;display:table;border:1px solid red;text-align:center;}
.center{display:table-cell;vertical-align:middle;}
.content{display:inline-block;text-align:center; border:1px solid green;}