The site uses 5 panels which are reached by clicking on buttons which bring them into view, I used absolute positioned screens and transforms of 100% in whatever direction to move the screens around the central one and then set the body to overflow:hidden.
IN ORDER TO EDIT THE SCREENS:
In the navigator panel the order of the screens is::
Select the screen you wan to edit and go to the style panel
At the bottom of the style panel is the transforms section - click the eye icon to reverse the transform
Edit the page
Just click the eye icon again to put it all back in place!