body {
     padding-bottom: 1000px;
}
body:after {
    content: "";
    height: 3000px;
	position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
	background-image: ;
/*    background-color: #000;*/
	background-position: 40% 100%, 50% 100%, 63% 100%;
	background-repeat: no-repeat;
    background-size: auto 180px,auto 280px,auto 180px;
    z-index: 1;

	background: #819FF7;
}

.curtain {
	height: 500px;
	position: relative;
	z-index: 2;
}