JSFiddle - React, Tailwind, and code Playground

HTML

<div class="wrapper">
    <div class="middle">Foo bar<br/>baz.</div>
</div>

CSS

html, body {
    height: 100%;
    width: 100%;
    padding: 0;
    margin: 0;
}

body {
    display: table;
}

.wrapper {
    display: table-cell;
    vertical-align: middle;
}

.middle {
    margin: auto;
    background: blue;
    color: white;
    padding: 10px;
    max-width: 200px;
}