animate.css/source/rotating_exits/rotateOutUpLeft.css

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

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

.rotateOutUpLeft {
  animation-name: rotateOutUpLeft;
}