CSS Flip Rotation Entrance

selector {
  animation: flip-rotation .75s ease forwards;
}

@keyframes flip-rotation {
  0% {
    opacity: 0;
    transform: translateY(45px) rotate3d(1, 1, 0, 45deg);
  }

  100% {
    opacity: 1;
    transform: translateY(0);
  }
}