xiantuo/node_modules/animate.css/source/sliding_exits/slideOutDown.css

@keyframes slideOutDown {
  from {
    transform: translate3d(0, 0, 0);
  }

  to {
    visibility: hidden;
    transform: translate3d(0, 100%, 0);
  }
}

.slideOutDown {
  animation-name: slideOutDown;
}