JSFiddle - React, Tailwind, and code Playground

HTML

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

CSS

div.parent {
    display: grid;
    height: 500px;
    background: red;
}
div.child {
    justify-self: center;
    align-self: center;
    height: 200px;
    width: 200px;
    background: blue;
}