animate.css/source/attention_seekers/tada.css

@keyframes tada {
	0% {
    transform: scale(1);
  }

	10%, 20% {
    transform: scale(0.9) rotate(-3deg);
  }

	30%, 50%, 70%, 90% {
    transform: scale(1.1) rotate(3deg);
  }

	40%, 60%, 80% {
    transform: scale(1.1) rotate(-3deg);
  }

  100% {
    transform: scale(1) rotate(0);
  }
}

.tada {
	animation-name: tada;
}