index.html

<!DOCTYPE html>

<html lang="en">

<head>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1, user-scalable=no, minimal-ui">
    <title>Phaser Boilerplate</title>

    <style>
        html,
        body {
            margin: 0;
            background: #333;
        }
    </style>
</head>

<body>
    <div id="game-container"></div>
    <script src="app.js"></script>
</body>

</html>