JSFiddle - React, Tailwind, and code Playground

HTML

<div>
  <h1>
    David
  </h1>
</div>

CSS

html, body {
  height: 100%;
  margin: 0;
}

div {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  height: 100%;
}