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-webkit-animation: arrow 0.4s infinite alternate;
animation: arrow 0.4s infinite alternate;

@-webkit-keyframes arrow {
  0% {
    -webkit-transform: translate3d(0, -60%, 0);
            transform: translate3d(0, -60%, 0);
  }
  100% {
    -webkit-transform: translate3d(0, 0, 0);
            transform: translate3d(0, 0, 0);
  }
}
@keyframes arrow {
  0% {
    -webkit-transform: translate3d(0, -60%, 0);
            transform: translate3d(0, -60%, 0);
  }
  100% {
    -webkit-transform: translate3d(0, 0, 0);
            transform: translate3d(0, 0, 0);
  }
}