Listing 9.3. Style wewnętrzne
<!DOCTYPE html>
<html lang="pl">
  <head>
    <title>Style wewnętrzne</title>
    <meta charset="UTF-8" />
    <style>
        h1 {
            width: 300px;
            margin: 20px;
            background: blue;
            color: white;
            border: 4px solid black;
            text-align: center;
        }
    </style>
  </head>
<body>

<h1>WITAJ</h1>

</body>
</html>