@-moz-keyframes bounce {
  0%, 20%, 50%, 80%, 100% {
    transform: translateY(0);
  }
  40% {
    transform: translateY(em(-30px));
  }
  60% {
    transform: translateY(em(-15px));
  }
}
@-webkit-keyframes bounce {
  0%, 20%, 50%, 80%, 100% {
    transform: translateY(0);
  }
  40% {
    transform: translateY(em(-30px));
  }
  60% {
    transform: translateY(em(-15px));
  }
}
@-o-keyframes bounce {
  0%, 20%, 50%, 80%, 100% {
    transform: translateY(0);
  }
  40% {
    transform: translateY(em(-30px));
  }
  60% {
    transform: translateY(em(-15px));
  }
}
@keyframes bounce {
  0%, 20%, 50%, 80%, 100% {
    transform: translateY(0);
  }
  40% {
    transform: translateY(em(-30px));
  }
  60% {
    transform: translateY(em(-15px));
  }
}