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<!DOCTYPE html>
<html>
<head>
<style> 
div {
  width: 100px;
  height: 100px;
  background: red;
  position: relative;
  animation: mymove 5s infinite;
}
@keyframes mymove {
  0%   {top: 0px; left: 0px; background: red;}
  25%  {top: 0px; left: 100px; background: blue;}
  50%  {top: 100px; left: 100px; background: yellow;}
  75%  {top: 100px; left: 0px; background: green;}
  100% {top: 0px; left: 0px; background: red;}
}
</style>
</head>
<body>
<h1>The @keyframes Rule</h1>
<div></div>
</body>
</html>