JSFiddle - React, Tailwind, and code Playground

by Soviut

HTML

<div class="page">
  <header>
    this is a header
  </header>

  <main>
    this is the main
  </main>
</div>

CSS

.page {
  position: fixed;
  height: 100%;

  display: flex;
  flex-direction: column;
}