Untitled

html lang="pl-PL">
<head>
    <meta charset="UTF-8">
    <title>Sass - Zadania</title>
    <link href="css/main.css" rel="stylesheet">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
</head>
<body>

    <div class="container">
      <div class="sidebar">
        <h1>Main header</h1>
      </div>
      <section>
        <h1>Main section</h1>
      </section>
    </div>

</body>
</html>