animate.css/source/rotating_exits/rotateOutUpRight.css

@keyframes rotateOutUpRight {
  0% {
    transform-origin: right bottom;
    transform: rotate(0);
    opacity: 1;
  }

  100% {
    transform-origin: right bottom;
    transform: rotate(90deg);
    opacity: 0;
  }
}

.rotateOutUpRight {
  animation-name: rotateOutUpRight;
}