JSFiddle - React, Tailwind, and code Playground

HTML

<div></div><div></div><div></div><div></div><div></div><div></div>

CSS

div {
  padding: .25%;
  margin: 1%;
  display: inline-flex;
  background:lightsteelblue;
}

div:before {
  display: block;
  content: '';
  width: 1rem;
  height: 1rem;
  background: white;
}