@-moz-keyframes perspectiveLeft {
  0% {
    transform-origin: 0 0;
    transform: perspective(em(800px)) rotateY(0deg);
  }
  100% {
    transform-origin: 0 0;
    transform: perspective(em(800px)) rotateY(-180deg);
  }
}
@-webkit-keyframes perspectiveLeft {
  0% {
    transform-origin: 0 0;
    transform: perspective(em(800px)) rotateY(0deg);
  }
  100% {
    transform-origin: 0 0;
    transform: perspective(em(800px)) rotateY(-180deg);
  }
}
@-o-keyframes perspectiveLeft {
  0% {
    transform-origin: 0 0;
    transform: perspective(em(800px)) rotateY(0deg);
  }
  100% {
    transform-origin: 0 0;
    transform: perspective(em(800px)) rotateY(-180deg);
  }
}
@keyframes perspectiveLeft {
  0% {
    transform-origin: 0 0;
    transform: perspective(em(800px)) rotateY(0deg);
  }
  100% {
    transform-origin: 0 0;
    transform: perspective(em(800px)) rotateY(-180deg);
  }
}