JSFiddle - React, Tailwind, and code Playground

HTML

<!doctype html>
<html>
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>


<style>
    .container{
    display:flex;
    }

    .box{
    background-color:black;
    }
    body{margin:0}
</style>


<body>
 <div class="container">
  <div class="box">box</div>
 </div>
</body>
</html>