JSFiddle - React, Tailwind, and code Playground

HTML

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Document</title>
</head>
<body>
<div class="container">
  <div class="block">1</div>
  <div class="block">2</div>
  <div class="block">3</div>
  <div class="block">4</div>
  <div class="block">5</div>

 </div>
</body>
</html>

CSS

.container{
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-start;
}

.block{
  background-color: grey;
  flex-basis: 30%;
  margin: 5px;
}