.parallax {
	position: relative;
	overflow: hidden;
}

.parallax-layer {
	--height: 100%;
	--dy: 0px;
	position: absolute;
	left: 0;
	right: 0;
	z-index: 0;
	will-change: transform;
	-webkit-backface-visibility: hidden;
	backface-visibility: hidden;
}

.parallax-layer.parallax-bg {
	top: 0;
	bottom: 0;
	background-position: 50% calc(50% + var(--dy, 0px ));
	background-size: auto var(--height, 100%);
}

.parallax-layer.parallax-3d {
	top: 50%;
	transform: translate3d(0, calc(-50% + var(--dy, 0px )), 0);
	height: var(--height, 100%);
	background-position: center;
	background-size: cover;
	will-change: transform;
}

.parallax-layer.parallax-y {
	top: 50%;
	transform: translateY(calc(-50% + var(--dy, 0px )));
	height: var(--height, 100%);
	background-position: center;
	background-size: cover;
}

.parallax-layer.fixed {
	top: 0;
	bottom: 0;
	background-attachment: fixed;
	background-position: center;
	background-size: cover;
}

.parallax-layer.transparent {
	opacity: .5;
}