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

body {
    background: black;
}
#gameCanvas {
    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;
    top: 10px;
    right: 10px;
    background: white;
    color: black;
    padding: 10px;
    border: none;
    cursor: pointer;
    font-size: 20px;
    font-weight: bold;
    border-radius: 5px;
}