check this pen:
Its a horizontal gallery that scrolls sidewards even when you scroll down/up on your mouse, so it works for people who use a mouse with a classic mousewheel.
I wrote it exactly like that in laytheme, the layout looks fine but the scroll-modification doesnt work. its just a normal scroll so far. It seems i have to give the Galerie-Div a overflow property to make it scrollable in laytheme, but this seems to deactivate the scroll-fix in the codepen.
Thank you very much for taking a look.