JSFiddle - React, Tailwind, and code Playground

HTML

<div id="wrapper">
  <div id="box"></div>
</div>

CSS

html, body {
  width: 100%;
  height: 100%;
  overflow: hidden;
}

#wrapper {
  width: 100%;
  height: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
  background-color: blue;
}

#box {
  width: 80vw;
  height: 45vw;
  background-color: red;
}