সিএসএস animation-direction

<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<style>
.animation {
  width: 50px;
  height: 50px;
  background: pink;
  position: relative;
  animation: myfirst 5s 2;
  animation-direction: alternate;
}

@keyframes myfirst {
  0%   {background: red; left: 0px; top: 0px;}
  25%  {background: yellow; left: 200px; top: 0px;}
  50%  {background: blue; left: 200px; top: 200px;}
  75%  {background: green; left: 0px; top: 200px;}
  100% {background: red; left: 0px; top: 0px;}
}
</style>
</head>
<body>
<div class="animation"></div>
</body>
</html>