JSFiddle - React, Tailwind, and code Playground

HTML

<!doctype html>
<html>
  <head>
    <script type='text/javascript'>
     function setupDiv() {
       document.getElementById('div')
               .setAttribute('style'
             , 'position: absolute; top: 30px; left: 0px; width: '
             +window.innerWidth +'px; height: '
             +window.innerHeight+'px; border: 1px solid #ff0000');
     }
     window.onload = setupDiv;
    </script>
  </head>
  <body>
    <div id='div'>
    </div>
  </body>
</html>