div {
  display: inline-block;
  background-color: RGBa(240,160,0,0.5);
  height: 100px;
  width: 100px;
  margin: 50px 5px;
  animation: rotation 5s linear infinite;

}
@keyframes rotation {
  0% {
    transform: perspective(100px) rotate3d(1,1,1,0deg);
  }
  50%{
    transform: perspective(100px) rotate3d(1,1,1,180deg);
  }
  100% {
    transform: perspective(100px) rotate3d(1,1,1,360deg);
  }
}