JSFiddle - React, Tailwind, and code Playground

HTML

<div>
    <div>&nbsp;</div>
    <div>&nbsp;</div>
    <div>&nbsp;</div>
    <div>&nbsp;</div>
</div>

CSS

div {
    float: left;
    padding: 20px 0 0 20px;
    overflow: hidden;
    border: 4px solid black;
}

div > div {
    float: left;
    width: 50px;
    height: 50px;
    margin: 0 20px 20px 0;
    border: 4px solid black;
}

div > div:nth-child(3n) {
    clear: both;
}