* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    background: black;
}

#canvas {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    border: 5px solid white;
    max-width: 100%;
    max-height: 100%;
}

#playerImage, #backgroundImage, #enemyImage {
    display: none;
}

#fullScreenButton {
    position: absolute;
    font-size: 20px;
    padding: 10px;
    top: 10px;
    left: 50%;
    transform: translateX(-50%);
}