<!doctype html>
  <head>
  </head>

  <body>
    <h1>This is the homepage.</h1>
    <p>
    <a href="http://erinsoper.com/hello_world.html">Hello World!</a>
    </p>
  </body>
</html>

<!doctype html>
  <head>
    <link rel="stylesheet" type="text/css" href="stylesheet.css">
  </head>

  <body>
    <h1>This is the homepage.</h1>
    <p>
    <a href="http://erinsoper.com/hello_world.html">Hello World!</a>
    </p>
  </body>
</html>

Add .css ref in header
Add .css ref in header