animate.css/source/attention_seekers/shake.css

@keyframes shake {
  0%, 100% {
    transform: translate3d(0, 0, 0);
  }

  10%, 30%, 50%, 70%, 90% {
    transform: translate3d(-10px, 0, 0);
  }

  20%, 40%, 60%, 80% {
    transform: translate3d(10px, 0, 0);
  }
}

.shake {
  animation-name: shake;
}