JSFiddle - React, Tailwind, and code Playground

HTML

<div class="outer">
    <div class="inner"></div>
</div>

CSS

.outer {
    width: 200px;
    height: 200px;

    text-align: center;
    vertical-align: middle;

    background-color: #ffc;
}

.inner {
    display: inline-block;

    width: 100px;
    height: 100px;

    background-color: #fcc;
}