<html>
 <head>
<style>
  .hello{
  	text-align: center;
  	padding: 2%;
  }
  .readonly{
  	width: 90%;
  	height: 80vmin;
  	display: block;
 	margin: auto;
  }
  .code{
  	margin: auto;
  	align-items: center;
  }
</style>
 </head>
 <body>
   <p class="hello">Hello World!<p>
<div class="code">
<textarea class="readonly" readonly="readonly">