<!DOCTYPE html>
<html lang="cz">
  <head>
    <title>Title</title>
    <meta charset='utf-8'>
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <link rel="stylesheet" href="style.css">
  </head>
  <body>
    <div>

     Princip funkce serveru

    </div>

    <script>
      // code
    </script>
  </body>
</html>