Couldn't make scrollable grid

Excuse me for writing question in issue but I didn't find another the way to do it (Maybe you will explain me and I will appreciate it).
The demis are awesome and it looks amazing!

My question is: How do you scroll the page, if you have a static position on your content and what do u use for syncronizing the page scroll and content scroll in first demo.

Thank you for answering me in advance.
