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

.curtains{
	width: 980px;
	z-index:1;
	position:relative;
	margin-right: auto;
	margin-left: auto;
}

.curtains>li{
    -webkit-transform:translateZ(0);
    background: white;
    position: fixed;
    display:block;
    top: 0;
    left: 0;
    width: 100%;
    min-height: 100%;
    overflow: hidden;
    z-index:1;
}
.curtains>li.hidden{display:none;}