@keyframes shake {

  20%, 80% {
    transform: translate3d(1px, 0, 0);
  }

  30%, 50%, 70% {
    transform: translate3d(-2px, 0, 0);
  }

  40%, 60% {
    transform: translate3d(3px, 0, 0);
  }
}

@mixin shaking() {
  animation: shake 400ms cubic-bezier(.36, .07, .19, .97) both;
  transform: translate3d(0, 0, 0);
  backface-visibility: hidden;
  perspective: 1000px;
}