JSFiddle - React, Tailwind, and code Playground

HTML

<div class="page">
  Testing 123
</div>

CSS

body{
  font-size: 18px;
  background: black;
}

.page {
  padding: 1em;
  font-size: 2em;
  margin: 1em;
  background-image: linear-gradient(red, red),
                    linear-gradient(blue, blue);
  background-clip: content-box,
                   padding-box;
}

html, body{
  margin: 0;
  padding: 0;
}