img {
  width: 300px;
  animation: myanimation 1s ease-in-out 0s infinite normal none;
}
@keyframes myanimation {
  20% {
    opacity: 1;
  }
  35% {
    transform: scale(0.5);
  }
  50% {
    opacity: 0;
  }
  65% {
    transform: scale(1.2);
  }
  80% {
    opacity: 1;
  }
}