animate.css/source/rotating_exits/rotateOutDownRight.css

@keyframes rotateOutDownRight {
  from {
    opacity: 1;
  }

  to {
    transform: rotate3d(0, 0, 1, -45deg);
    opacity: 0;
  }
}

.rotateOutDownRight {
  animation-name: rotateOutDownRight;
  transform-origin: right bottom;
}