JSFiddle - React, Tailwind, and code Playground

HTML

<div parent>
    <div child>?
    </div>
</div>

CSS

[parent] {
    display: table-cell;
    text-align: center;
    vertical-align: middle;
    width: 200px;
    height: 200px;
    border: 1px solid red;
}

[child] {
    width: 50px;
    height: 50px;
    background: lightsteelblue;
    display: inline-block;
}