1<!DOCTYPE html> 2<html> 3<head> 4 <style> 5 body { 6 -webkit-animation-name: throb; 7 -webkit-animation-iteration-count: infinite; 8 -webkit-animation-duration: 2s; 9 -webkit-animation-timing-function: ease-in-out; 10 } 11 12 @-webkit-keyframes throb { 13 0% { background-color: #fff; } 14 50% { background-color: #000; } 15 100% { background-color: #fff; } 16 } 17 </style> 18</head> 19<body> 20</body> 21</html> 22