Codecademy - Practising CSS (Example 3 - HTML Code)

<!DOCTYPE html>
<html lang="en" dir="ltr">
  <head>
    <meta charset="utf-8">
    <title>CSS Challenge 3</title>
    <link rel="stylesheet" href="style.css">
  </head>
  <body>
    <div id="box">
      <div id="left">
      </div>
      <div id="right">
      </div>
    </div>
  </body>
</html>