<!DOCTYPE html>
<html>
<head>
  <title>Stylesheets tests</title>
  <meta charset="utf-8">
  <style>
    main {
      margin: 20px;
    }
  </style>
  <link rel="stylesheet" href="stylesheet1.css"/>
</head>
<body>
  <main>
    <main>
      <div>Stylesheet Tests</div>
    </main>
  </main>
</body>
</html>