page-layout.html

<html>
  <head>
    <title>page-layout</title>
    <link rel="stylesheet" href="styles.css"/>
  </head>
  <body>
    <div class="page">
      <header class="main-header">
        <h1>Header</h1>
      </header>
      <main class="container">
        <nav>
          <h1>Nav</h1>
        </nav>
        <article class="content">
          <h1>Article</h1>
        </article>
        <aside class="side-bar">
          <h1>Aside</h1>
        </aside>
      </main>
      <footer>
        <h1>Footer</h1>
      </footer>
    </div>
  </body>
</html>