div.level4 div.ascen4{
    position: absolute;
    top: 43%;
    z-index: 8;
    height: 43%;
    cursor: pointer;
}

div.level4 div.porte4{
    position: absolute;
    top: 43%;
    z-index: 8;
    height: 40%;
    cursor: pointer;
}

div.level4 img.fleche{
    z-index: 6;
    position: absolute;
}

div.level4 img.fleche4{
    top:75%;
    height: auto;
}

div.level4 img.panneau4{
    top:25%;
    height: auto;
}