#cloud1 {
	position: fixed;
	top: 60px;
	left: 770px;
	opacity: 0.4;
}

#cloud2 {
	position: fixed;
	top: 140px;
	left: 300px;
	opacity: 0.3;
}

#cloud3 {
	position: fixed;
	top: 530px;
	left: 1020px;
	opacity: 0.4;
}

.cloud-off {
	display: none;
}

.cloud-on {
	z-index: 100;
}