animate.css/source/fading_exits/fadeOutTopRight.css

@keyframes fadeOutTopRight {
  from {
    opacity: 1;
    transform: translate3d(0, 0, 0);
  }
  to {
    opacity: 0;
    transform: translate3d(100%, -100%, 0);
  }
}

.fadeOutTopRight {
  animation-name: fadeOutTopRight;
}