Documentation: make scrollbars easier to use (wider)

The scrollbars on docs.wappler.io are set to be 4px wide. This requires some precise mouse pointing:

Could this be increased to about 10px perhaps?

On Windows it’s just awkward; on a Mac for some reason, the scrollbars are almost unusable.

(I would probably use the mousewheel most of the time, but at times, scrollbars are useful - as long as they’re useable.)