Custom framework

Hi,

Seems that webflow is using their own custom framework, correct? Is it a fork of another framework?

Just wondering if anyone had challenges adding another framework like bootstrap or foundation?

Webflow uses a fork of Bootstrap 3.0 for its scaffolding (responsive grid) only. Everything other element is just basic html elements that you can drag in. We want all the elements to have the least amount of bloat/styles for you guys so you can build a clean website.

At the moment webflow is using the bootstrap grid with 940 pix (width). As I understand so far it cannot be changed.
But the bootstrap grid with 1140 pix is more common now. Would it be available in the near future?

Or what would you suggest to build a website based on bootstrap grid with 1140 pix?