body{
	background:#66c;
	background-image:linear-gradient(-25deg, #66c,#fff);
	height:100vh;
	margin:0 auto;
	overflow:hidden;
	transition: height 0.5s ease;
}

body:hover{
	background:#66c;
	background-image:linear-gradient(-25deg, #66c000,#fff);
	height:10vh;
}


svg{
	position:absolute;
	top:50%;
	left:50%;
	transform:translate(-50%,-50%);
	max-width:400px;
}