.circle-right {
   width: 100px;
  height: 100px;
  border-radius: 50%;
  background-color: #ff7f50;
  animation: moveCircle 20s linear;
  transform: translateZ(0);
 }

@keyframes moveCircle {
  0% {
    transform: translateX(-300%);
  }
  100% {
    transform: translateX(10%);
  }
}