JSFiddle - React, Tailwind, and code Playground

HTML

<header></header>
<section></section>
<section></section>
<section></section>
<section></section>

CSS

section {
    margin: 10px;
    width: 100px;
    height: 100px;
    background: #ccc;
    float: left;
}

section:nth-of-type(2) {
    border: 2px solid red;
}