What should be written in the blank of the code for JQuery Code Used to Apply CSS3 Animations?

CSS Code:
_________ leftmove {
100% { transform: translateX(-70px); opacity: 1; }
}
_________ rightmove {
100% { transform: translateX(70px); opacity: 1; }
}

jQuery Code:
<script>
$(function() {
var footerBottom = $("#articlefooter").offset().top + $("#articlefooter").height();
$(window).scroll(function() {
if ($(this).scrollTop() > (footerBottom - $(window).height())) {
131
$("#prevpage").css('animation', 'leftmove 1s 2s forwards');
$("#nextpage").css('animation', 'rightmove 1s 1s forwards');
});
});
</script>