Change animation right to left

I want to change the animation of right to left so that the text eases in but does not go over the stop point and back again.
I have found the css code for this and copied it to my child theme

.avia_transform .avia_start_delayed_animation.right-to-left {
-webkit-animation: avia-rtl 2.5s 1 cubic-bezier(0.175, 0.885, 0.320, 1.275); /* Safari 4+ */
animation:         avia-rtl 2.5s 1 cubic-bezier(0.175, 0.885, 0.320, 1.275); /* IE 10+ */
opacity: 1;
}

I just need to stop it going slightly to the left of the stop point and back again, but cant work out how to do it

Many Thanks
Regards
Colin