html,body{
	padding:0;
	margin:0;
	width: 100vw;
	height: 100vh;
	overflow: none;
}
div{
	position:absolute;
	top:0;
	left:0;
}
div:nth-child(1){
	width:100vw;
	height:100vh;
	background-image:url('stars.gif');
	background-size: cover;
	background-repeat:repeat;
}
div:nth-child(2){
	width:100vw;
	height:100vh;
	background-image:url('earth.gif');
	background-size: contain;
	background-repeat:no-repeat;
	background-position:center center;
}