.revealDirRight:after {
    animation-name: blockSlideToRight;
}
@keyframes blockSlideToRight {
    0% { left: 0; right: auto; width: 0%; }
    45% { left: 0; right: auto; width: 100%; }
    55% { left: auto; right: 0; width: 100% }
    to { left: auto; right: 0; width: 0% }
}