JSFiddle - React, Tailwind, and code Playground

HTML

<div class="parent">
    <div class="child"></div>
</div>

CSS

.parent {
    width: 300px;
    background: #f00;
    height: 200px;
    display: table-cell;
    vertical-align: middle;
}

.child {
    width: 150px;
    margin: auto;
    height: 100px;
    background: #000;
}