html, body{
    margin:0px;
    z-index:-1000;
    width:100%;
    height:100%;
    overflow:hidden;
}
.forme-fixe{
    width:100%;
    height:100%;
    overflow:hidden;
    z-index:-1000;
    position:fixed;
}
.etape, .etape2, .forme-fixe{
    text-align:center;
    height:100%;
    width:100%;
    margin:0px;
}
.etape{
    z-index:500;
    position:absolute;
    overflow:hidden;
}
.forme-fixe{
}
.etape img, .forme-fixe img, .etape2 img{
    height:100%;
    top:0px;
}
#debut{
    display:none;
    text-align:center;
    width:100%;
    position:absolute;
    bottom:100px;
    z-index:999;
    font-family: helvetica, sans-serif;
    color:black;
    font-size:1.4em;
    cursor:pointer;
}
.etape2 {
    margin-top:25%;
    height:0%;
    opacity: 0;
    filter: alpha(opacity=0); /* For IE8 and earlier */
    z-index:400;
}