.my3dDiv {
  transform: translateZ(50px);
  transition: transform 0.3s;
  animation: pulsatingShadow 2s infinite ease-in-out;
}

.my3dDiv:hover {
  transform: translateZ(100px);
}

@keyframes pulsatingShadow {
  0%, 100% {
    box-shadow: 5px 5px 10px rgba(0,0,0,0.5);
  }
  50% {
    box-shadow: 10px 10px 20px rgba(0,0,0,0.7);
  }
}