@-webkit-keyframes square-spin {
  25% {
    -webkit-transform: perspective(100px) rotateX(180deg) rotateY(0);
            transform: perspective(100px) rotateX(180deg) rotateY(0); }

  50% {
    -webkit-transform: perspective(100px) rotateX(180deg) rotateY(180deg);
            transform: perspective(100px) rotateX(180deg) rotateY(180deg); }

  75% {
    -webkit-transform: perspective(100px) rotateX(0) rotateY(180deg);
            transform: perspective(100px) rotateX(0) rotateY(180deg); }

  100% {
    -webkit-transform: perspective(100px) rotateX(0) rotateY(0);
            transform: perspective(100px) rotateX(0) rotateY(0); } }

@keyframes square-spin {
  25% {
    -webkit-transform: perspective(100px) rotateX(180deg) rotateY(0);
            transform: perspective(100px) rotateX(180deg) rotateY(0); }

  50% {
    -webkit-transform: perspective(100px) rotateX(180deg) rotateY(180deg);
            transform: perspective(100px) rotateX(180deg) rotateY(180deg); }

  75% {
    -webkit-transform: perspective(100px) rotateX(0) rotateY(180deg);
            transform: perspective(100px) rotateX(0) rotateY(180deg); }

  100% {
    -webkit-transform: perspective(100px) rotateX(0) rotateY(0);
            transform: perspective(100px) rotateX(0) rotateY(0); } }
.square-spin > div {
  -webkit-animation-fill-mode: both;
          animation-fill-mode: both;
  width: 50px;
  height: 50px;
  background: #fff;
  border: 1px solid red;
  -webkit-animation: square-spin 3s 0s cubic-bezier(.09, .57, .49, .9) infinite;
          animation: square-spin 3s 0s cubic-bezier(.09, .57, .49, .9) infinite; }