@keyframes right {
    100% {
        left: 500000px;
    }
}

.animate-right {
    animate: right 500s 1;
}

function(e) {
    var el = this;

    setTimeout(function() {
        el.className = el.className.replace('animate-right', '');
    }, 500);

    el.className += ' ' + animate-right;
}