Center full page flex

<div class="flex h-screen items-center justify-center">
  <h1>Title</h1>
</div>

<div class="flex h-screen">
  <div class="m-auto">
    <h1>Title</h1>
  </div>
</div>

From https://jetthoughts.com/blog/vertical-align-with-full-screen-across-tailwind-css-jetthoughts/

.