JSFiddle - React, Tailwind, and code Playground

HTML

<main>
   <div>
      Doh!!!!!!!!!!!
   </div>
   <div>
      Lorem ipsum dolor sit amet, consectetur adipiscing
      elit, sed do eiusmod tempor incididunt ut labore et
      dolore magna aliqua. Ut enim ad minim veniam.
   </div>
</main>

CSS

body {
   font-family: sans-serif;
   margin: 20px;
   }
main {
   display: flex;
   border: 3px solid silver;
   }
main >div {
   background-color: plum;
   margin: 10px;
	}
/*
main >div:first-child {
	-webkit-flex: 1 0 auto;
   }
*/