animate.css/source/bouncing_entrances/bounceIn.css

@keyframes bounceIn {
  0% {
    opacity: 0;
    transform: scale(.3);
  }

  20% {
    transform: scale(1.1);
  }

  40% {
    transform: scale(.9);
  }

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

  80% {
    transform: scale(.97);
  }

  100% {
    opacity: 1;
    transform: scale(1);
  }
}

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