*{
    margin: 0;
    padding: 0;
}

body {
    overflow: hidden;
}

div {
    position: absolute;
}

#fondContaineur {
    width: 4000px;
    height: 3000px;
    
    margin-top: -1500px;
    margin-left: -2000px;
    
    background-color: black;
    
    top: 50%;
    left: 50%;
}

#gameContainer {
    width: 1600px;
    height: 928px;
    
    margin-top: -464px;
    margin-left: -800px;
    
    background-color: skyblue;
    
    top: 50%;
    left: 50%;
}