<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>This text is the title of the document</title>
  <link rel="stylesheet" href="mystyles.css">
</head>
<body>
  <main>
    <header>
      <h1>Title</h1>
      <p>This is the introduction</p>
    </header>
    <section>
      <p>Sentence 1</p>
      <p>Sentence 2</p>
      <p>Sentence 3</p>
      <p>Sentence 4</p>
    </section>
  </main>
</body>
</html>