JSFiddle - React, Tailwind, and code Playground

HTML

<div></div>
<div></div><br style="clear:both;">
<div></div>
<div></div><br style="clear:both;">

CSS

div {
    width: 50px;
    height: 50px;
    background-color: red;
    float: left;
}
div:nth-child(2n) {
    background-color: green;
    float: right;
}