@keyframes shake {
  0% {
    transform: rotateZ(0);
  }
  10% {
    transform: rotateZ(-25deg);
  }
  20% {
    transform: rotateZ(13deg);
  }
  30% {
    transform: rotateZ(-9deg);
  }
  40% {
    transform: rotateZ(7.5deg);
  }
  50% {
    transform: rotateZ(-6deg);
  }
  60% {
    transform: rotateZ(5deg);
  }
  70% {
    transform: rotateZ(-4.28571deg);
  }
  80% {
    transform: rotateZ(3.75deg);
  }
  90% {
    transform: rotateZ(-3.33333deg);
  }
  100% {
    transform: rotateZ(0);
  }
}

li:hover > a > .goyang {
  animation: shake 1200ms;
}

.dropdown-menu.animated {
  /* Speed up animations */
  -webkit-animation-duration: 0.70s;
  animation-duration: 0.70s;
  -webkit-animation-timing-function: ease;
  animation-timing-function: ease;
}