@-moz-keyframes rotateDown {
  0% {
    transform-origin: 0 0;
    transform: perspective(em(800px)) rotateX(0deg) translateZ(0px);
  }
  100% {
    opacity: 0;
    transform-origin: 50% 100%;
    transform: perspective(em(800px)) rotateX(-180deg) translateZ(em(300px));
  }
}
@-webkit-keyframes rotateDown {
  0% {
    transform-origin: 0 0;
    transform: perspective(em(800px)) rotateX(0deg) translateZ(0px);
  }
  100% {
    opacity: 0;
    transform-origin: 50% 100%;
    transform: perspective(em(800px)) rotateX(-180deg) translateZ(em(300px));
  }
}
@-o-keyframes rotateDown {
  0% {
    transform-origin: 0 0;
    transform: perspective(em(800px)) rotateX(0deg) translateZ(0px);
  }
  100% {
    opacity: 0;
    transform-origin: 50% 100%;
    transform: perspective(em(800px)) rotateX(-180deg) translateZ(em(300px));
  }
}
@keyframes rotateDown {
  0% {
    transform-origin: 0 0;
    transform: perspective(em(800px)) rotateX(0deg) translateZ(0px);
  }
  100% {
    opacity: 0;
    transform-origin: 50% 100%;
    transform: perspective(em(800px)) rotateX(-180deg) translateZ(em(300px));
  }
}