JSFiddle - React, Tailwind, and code Playground

HTML

<div class="abc"></div>
<div class="abc"></div>
<div class="abc"></div>
<div class="efg"></div>
<div class="efg"></div>

CSS

div {
  height:25px;
  width:25px;
  background: blue;
  float: left;
  margin:5px;
}

div.abc:nth-of-type(3) {
  background:red;
}