index.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <link rel="stylesheet" href="style.css">
</head>
<body>
    <div class="container">
        <button class="btnPlay">Dołącz do gry</button>
        <div class="clientsSize"></div>
        <div class="clientID"></div>
    </div>
    <script src="index.js"></script>
</body>
</html>