Dancing

.dancing {
  animation: dancing 1s ease-in-out both;
}

@keyframes dancing {
  0% {
    transform: skew(0deg);
  }
  25% {
    transform: skew(-40deg);
  }
  50% {
    transform: skew(40deg);
  }
  75% {
    transform: skew(-40deg);
  }
  100% {
    transform: skew(0deg);
  }
}