StringBean – The 4K Featherweight CSS Framework [↗]
Build seemless – featherweight – responsive scaffold apps for mobile, 4K, and beyond. StringBean is a pure CSS solution.
Another CSS framework, this one has a 24 point grid system, rather than the more common 12 point. Scores bonus points for having a class named “MEGA-UHD”. Other than that, looks like standard fare.