index.html

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <title>Break bricks</title>
    <link rel="stylesheet" href="assets/css/theme.css">
    <link rel="stylesheet" href="assets/css/index.css">
</head>

<body onkeydown="stop()">
    <h1 id="header1">Level 1</h1>
    <h1 id="header2">Level 1</h1>
    <div id="box">
        <div id="container1"></div>
        <div id="container2"></div>
        <div id="ball"></div>
        <div id="wood"></div>
        <div id="startgame"> Press Enter button</div>
        <div id="gameover">Game over <button id="restart">Restart</button></div>
        <div id="win">You win <a style="text-decoration: none" href="assets/pages/second.html"><button id="next">Next level</button></a></div>
    </div>
    <script src="assets/js/jquery-3.4.1.min.js"></script>
    <script src="js/first.js"></script>
</body>

</html>