.wa-icon {
  position: fixed;
  bottom: 30px;
  left: 20px;
  width: 60px;
  height: 60px;
  z-index: 999;
  cursor: pointer;
}

@keyframes latido {
  0%, 100% { transform: scale(1); }
  30%     { transform: scale(1.3); }
  50%     { transform: scale(0.9); }
  70%     { transform: scale(1.1); }
}

.latido {
  animation: latido 0.6s ease-in-out;
}