The worst site I visited the last 7days (iOS). A lot of things broken, flickering, broken scrolling, overlapping things, slow, laggy, buggy. Do you even test for mobile?
Because its an otherwise very useful and good looking CSS library.
Trying to tell me a big comprehensive CSS library breaking mobile devices in 2017 is useful is like trying to sell me a car that can't drive on pavement.
If your site needs good mobile support, don't use it I guess, but I have never had any issues on my low end Alcatel Pixi 4.