<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <link rel="stylesheet" href="css/style.css">
    <title>Document</title>
</head>
<body>
    <div class="wrapper">
        <header class="header">Header: Fixed height</header>
        <section class="content">Content: Stretched height</section>
      </div>          
</body>
</html>