@keyframes zoom-in-out {
  0% {
    transform: scale(100%);
  }
  
  50% {
    transform: scale(0.8);
  }

  100% {
    transform: scale(100%);
  }
}

#wa {
  animation-name: zoom-in-out;
  animation-duration: 2s;
  animation-iteration-count: infinite;
}