@keyframes flipOutY {
    0% {
        transform: perspective(400px) rotateY(0deg);
        opacity: 1;
    }
	100% {
        transform: perspective(400px) rotateY(90deg);
        opacity: 0;
    }
}

.flipOutY {
	backface-visibility: visible !important;
	animation-name: flipOutY;
}