The pages that are not the current page, next page, or previous page should all be off-screen. We do this by pushing them to the extreme left/right of the viewport.

(1) They are not pushed far enough off the screen for sufficiently wide screens (which I think can be fixed by using viewport units instead of percentages):

(2) I think they should be above/below the viewport, to capitalize on the runtime's resource loading. I thought this was the case, but I think this may have changed.