body {
    margin: 0;
    overflow: hidden;
    background: url('https://cdn.pixabay.com/photo/2016/08/14/14/58/pokemon-1593048_1280.jpg') no-repeat center center fixed;
    background-size: cover;
}

canvas {
    display: block;
}

#energyDisplay {
    position: absolute;
    top: 10px;
    left: 10px;
    color: white;
    font-size: 20px;
}

#timeDisplay {
    position: absolute;
    top: 10px;
    right: 10px;
    color: white;
    font-size: 20px;
}

button {
    position: absolute;
    top: 50px;
    left: 10px;
    font-size: 20px;
    margin: 5px;
}

#stopMusicButton,
#resumeGameButton,
#unmuteMusicButton {
    left: 150px;
}

#pauseGameButton,
#restartGameButton,
#muteMusicButton {
    left: 300px;
}