html{
    height: 100%;
    overflow-x: hidden;
}

.curtains{
    width: 100%;
    z-index:1;
    position:relative;
}

.curtains>li{
    /*background: url(../imagens/bg.jpg) 0 0 no-repeat fixed;*/
    background: #edeef0;
    position: fixed;
    display:block;
    top: 0;
    left: 0;
    width: 100%;
    min-height: 100%;
    overflow: hidden;
    z-index:1;
}
.curtains>li:first-child{z-index:2;}


.menu{
    -webkit-backface-visibility:hidden; /* Remove if you got display issues */}