JSFiddle - React, Tailwind, and code Playground

HTML

<div class="monitor"></div>

CSS

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

.monitor {
  width: auto;
  height: 100%;
  margin: 7% 7% 7% 7%;
  
  background-color:#396A3D;
 }