index.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <!-- Latest compiled and minified CSS -->
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.5.2/css/bootstrap.min.css">

    <!-- jQuery library -->
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>

    <!-- Popper JS -->
    <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.16.0/umd/popper.min.js"></script>

    <!-- Latest compiled JavaScript -->
    <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.5.2/js/bootstrap.min.js"></script>

    <link rel="stylesheet" href="css/style.css">
</head>
<body>

    <div class="container-fluid text-white">
        <nav class="nav navbar navbar-light text-center">
            <div id="score">
                <h2>Score</h2>
                <p class="lead" style="font-size: 30px;">0</p>
            </div>
            <div id="lives">
                <h2>Lives</h2>
                <p class="lead" style="font-size: 30px;">0</p>
            </div>
            <div id="kills">
                <h2>Kill Count</h2>
                <p class="lead" style="font-size: 30px;">0</p>
            </div>
        </nav>
        <div id="menu" class='text-center'>
            <h1>ATTACK ON GALAXY</h1>
            <button class='btn bg-none text-white lead btn-lg' id='play'>Play</button>
        </div>
        <div id="player-ship" class='ship'>
            <img src="./images/pixel_ship_yellow.png" alt="player">
        </div>
        <div id="game-over" class='text-center'>
            <h1>Game Over</h1>
            <button class='btn bg-none text-white lead btn-lg' id='restart'>Restart</button>
        </div>
    </div>
    <script src="js/script.js"></script>
</body>
</html>