#scene{
    position: relative;
    z-index: 0;
    width: 3940px;
    height: 3000px;
    background-image: url(screen_bg.png);
    background-size: 100%;
}

#next{
    position: absolute;
    z-index: 1;
    width: 800px;
    height: 380px;
    background-image: url(NEXT.png);
    background-size: 100%;
    margin-left: 2900px;
    margin-top: 2300px;
}
#nom{
    position: absolute;
    z-index: 2;
    width: 4000px;
    height: 500px;
    background-image: url(nom.png);
    background-size: 100%;
    margin-left: ;
    margin-top: 1300px;