JSFiddle - React, Tailwind, and code Playground

HTML

<h1>test</h1>

CSS

body {
  padding: 0;
  margin: 0;
  background: #ffd200;
}

h1 {
  position: absolute;
  width: 100%;
  height: 100%;
  display: flex;
  justify-content: center; 
  align-items: center; 
}