1.circle {
2  animation: move571 4s linear infinite;
3}
4
5.circle.right {
6  animation-direction: reverse;
7}
8
9@keyframes move571 {
10  25% {
11    transform: translateX(-32px);
12  }
13
14  75% {
15    transform: translateX(32px);
16  }
17}