Rubber band

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

@keyframes rubber-band {
  0% {
    transform: scale(1);
  }
  30% {
    transform: scale(1.25);
  }
  40% {
    transform: scale(0.75);
  }
  50% {
    transform: scale(1.15);
  }
  65% {
    transform: scale(0.95);
  }
  75% {
    transform: scale(1.05);
  }
  100% {
    transform: scale(1);
  }
}