Unitless breakpoints
Unitless breakpoints

If I want to customise the breakpoints using `em`, I get compatibility errors.

It is good practice to set breakpoints in `em` instead of `px` when users use browser scaling.
See https://zellwk.com/blog/media-query-units/#concluding-the-experiments for more information why someone would like to do this. Only Safari users can get annoyed: https://adamwathan.me/dont-use-em-for-media-queries/

In any case, using a unitless number at line 42 would be very convenient.
twbs/bootstrap,peterblazejewicz/bootstrap,GerHobbelt/bootstrap,gijsbotje/bootstrap,GerHobbelt/bootstrap,peterblazejewicz/bootstrap,gijsbotje/bootstrap,coliff/bootstrap,bardiharborow/bootstrap,tagliala/bootstrap,stanwmusic/bootstrap,kvlsrg/bootstrap,tagliala/bootstrap,tjkohli/bootstrap,bardiharborow/bootstrap,nice-fungal/bootstrap,stanwmusic/bootstrap,fschumann1211/bootstrap,nice-fungal/bootstrap,fschumann1211/bootstrap,zalog/bootstrap,zalog/bootstrap,bardiharborow/bootstrap,kvlsrg/bootstrap,inway/bootstrap,coliff/bootstrap,inway/bootstrap,GerHobbelt/bootstrap,stanwmusic/bootstrap,yuyokk/bootstrap,stanwmusic/bootstrap,yuyokk/bootstrap,inway/bootstrap,yuyokk/bootstrap,m5o/bootstrap,fschumann1211/bootstrap,peterblazejewicz/bootstrap,yuyokk/bootstrap,gijsbotje/bootstrap,kvlsrg/bootstrap,tjkohli/bootstrap,tagliala/bootstrap,zalog/bootstrap,gijsbotje/bootstrap,fschumann1211/bootstrap,nice-fungal/bootstrap,twbs/bootstrap,m5o/bootstrap,bardiharborow/bootstrap