<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <title></title>
    <style>
      h1{
        border:5px solid red;
        padding:20px;
        margin:20px;
        display:block;
        width:100px;
      }
    </style>
  </head>
  <body>
    <h1>CSS</h1>
    <h1>CSS</h1>
  </body>
</html>

External CSS

This Pen doesn't use any external CSS resources.

External JavaScript

This Pen doesn't use any external JavaScript resources.