animate.css/source/bouncing_entrances/bounceIn.css

@keyframes bounceIn {
  0%, 20%, 40%, 60%, 80%, 100% {
    transition-timing-function: cubic-bezier(0.215, 0.610, 0.355, 1.000);
  }

  0% {
    opacity: 0;
    transform: scale3d(.3, .3, .3);
  }

  20% {
    transform: scale3d(1.1, 1.1, 1.1);
  }

  40% {
    transform: scale3d(.9, .9, .9);
  }

  60% {
    opacity: 1;
    transform: scale3d(1.03, 1.03, 1.03);
  }

  80% {
    transform: scale3d(.97, .97, .97);
  }

  100% {
    opacity: 1;
    transform: scale3d(1, 1, 1);
  }
}

.bounceIn {
  animation-name: bounceIn;
  animation-duration: .75s;
}