JSFiddle - React, Tailwind, and code Playground

HTML

<html>
<body>
<div class="p">parent</div>
<div class="c1">child1</div>
<div class="c2">child2</div>
</body>
</html>

CSS

.p,.c1,.c2{
  border:1px solid black;
  height: 50px;
  width: 50px;
}
.c1{
  background-color: red;
}
.c2{
  background-color: blue;
}