JSFiddle - React, Tailwind, and code Playground

HTML

<!DOCTYPE html>
<html>
<body>

  <div class="container">
    <div>1</div>
    <div>2</div>
    <div>3</div>  
    <div>4</div>
    <div>5</div>
  </div>

</body>
</html>

CSS

.container
{
	display:flex;
	flex-wrap:wrap;
}

.container > div
{
	width:100px;
    height:100px;
    border:1px #fff solid;
    text-align:center;
    font-size:2em;
    background:#66f;

	flex-grow:1;
}