Just looking to add delay / speed to this to make the images parallax while horizontally scrolling. It works fine vertically but I assume I need to pass in window width or something to get it working horizontally? Can't figure it out for some reason.   I'm currently working in a much larger project which I can't isolate easily so hopefully this example demonstrates the idea.   Thank you in advance for any replies!    EDIT - Would be an awesome feature to just pass i