JSFiddle - React, Tailwind, and code Playground

HTML

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

CSS

body > div{
  background: black;
  
}
div div:nth-child(1){
  width: 50px;
  height: 50px;
  background: red;
}
div div:nth-child(2){
  width: 20%;
  height: 20%;
  background: green;
}
div div:nth-child(3){
  width: 20%;
  height: 20%;
  position: absolute;
  background: yellow;
}