@keyframes flapLeft {

  0%,
  100% {
    transform: rotateY(0deg);
  }

  50% {
    transform: rotateY(65deg);
  }
}

@keyframes flapRight {

  0%,
  100% {
    transform: rotateY(0deg);
  }

  50% {
    transform: rotateY(-65deg);
  }
}

.paused .wing {
  animation-play-state: paused !important;
}