JSFiddle - React, Tailwind, and code Playground

HTML

<html>

  <head></head>

  <body></body>

</html>

CSS

html {
  width: 500px;
  height: 500px;
  background-color: #7a7a7a;
  border: 1px solid black;
  margin: 10px auto 0 auto;
}