JSFiddle - React, Tailwind, and code Playground

HTML

<body>
  	<div class="flexContainer">
  		Hello
  	</div>
  </body>

CSS

body {
  		display: flex;
  		flex-direction: row;
  		align-items: stretch;
  		align-content: stretch;
  		background-color: green;
		
		border: 2px solid red;
		
  	}
   	.flexContainer {
   		display: flex;
   		background-color: blue;
   	}