DrupalGap 8 is built with no particular CSS framework in mind, it wants to be abstract enough to support them all
For starters, we've added support for a personal favorite, Foundation.
We're also quite fond of Bootstrap, and will be supporting that very soon.
Adding support for other frameworks
As DrupalGap 8 evolves, it will have many more contributed modules and themes for popular CSS frameworks.
Want to see support for a particular CSS framework?
Please tell us about other CSS Frameworks of interest, and we welcome GitHub pull requests.