1<!doctype html> 2<html> 3<head> 4<style> 5body { 6 background-color: #cccccc; 7 8 background-image: 9 linear-gradient(45deg, #000000 25%, transparent 25%), 10 linear-gradient(-45deg, #000000 25%, transparent 25%), 11 linear-gradient(45deg, transparent 75%, #000000 75%), 12 linear-gradient(-45deg, transparent 75%, #000000 75%); 13 14 background-size:80px 80px; 15 background-position: 0 0, 0 80px, 80px -80px, -80px 0px; 16} 17</style> 18</head> 19<body> 20</body> 21</html> 22