* {
	box-sizing: border-box;
	-webkit-box-sizing: border-box;
	padding: 0;
	margin: 0;
}
body { background: #111;}

section { height: 100vh;}

section:nth-child(3n-2){ background: #6347A9;}
section:nth-child(3n-1){ background: #087CA7;}
section:nth-child(3n){ background: #048968;}