Fixes #20586
Fixes #20586

Use pixels instead of rem units for focus box-shadow on custom controls so that IE11, Edge, and Win FF screw it up less

JumpLinkNetwork/bootstrap-backward,kvlsrg/bootstrap,joblocal/bootstrap,Lyricalz/bootstrap,m5o/bootstrap,afuno/bootstrap,kvlsrg/bootstrap,xt0rted/bootstrap,twbs/bootstrap,NCARB/bootstrap,creativewebjp/bootstrap,hebbet/bootstrap,slavanga/bootstrap,sealocal/bootstrap,janseliger/bootstrap,bootstrapbrasil/bootstrap,vsn4ik/bootstrap,Scoutski/bootstrap,bardiharborow/bootstrap,xt0rted/bootstrap,lipis/bootstrap,igoynawamreh/bootstrap,edanbarak/bootstrap,seanwu99/bootstrap,gijsbotje/bootstrap,seanwu99/bootstrap,peterblazejewicz/bootstrap,jipexu/bootstrap,andresgalante/bootstrap,Lyricalz/bootstrap,tibo66/bootstrap,realcrowd/bootstrap,IdanCo/bootstrap,NCARB/bootstrap,bardiharborow/bootstrap,tibo66/bootstrap,yuyokk/bootstrap,lemuelbarango/bootstrap,stanwmusic/bootstrap,inway/bootstrap,TheFridayInstitute/bootstrap,xt0rted/bootstrap,sealocal/bootstrap,davethegr8/bootstrap,inway/bootstrap,slavanga/bootstrap,Hemphill/bootstrap-docs,tagliala/bootstrap,zalog/bootstrap,johnajacob/bootstrap,creativewebjp/bootstrap,slavanga/bootstrap,nice-fungal/bootstrap,creativewebjp/bootstrap,lipis/bootstrap,nice-fungal/bootstrap,copperdesign/bootstrap,GerHobbelt/bootstrap,stanwmusic/bootstrap,9-chirno/chirno,joblocal/bootstrap,realcrowd/bootstrap,lemuelbarango/bootstrap,bardiharborow/bootstrap,n054/bootstrap,edanbarak/bootstrap,joblocal/bootstrap,Hemphill/bootstrap-docs,Delagen/bootstrap,TheFridayInstitute/bootstrap,IdanCo/bootstrap,igoynawamreh/bootstrap,fschumann1211/bootstrap,lipis/bootstrap,copperdesign/bootstrap,jipexu/bootstrap,n054/bootstrap,supergibbs/bootstrap,9-chirno/chirno,fschumann1211/bootstrap,Lyricalz/bootstrap,SweetProcess/bootstrap,sealocal/bootstrap,Scoutski/bootstrap,yuyokk/bootstrap,Delagen/bootstrap,lipis/bootstrap,xt0rted/bootstrap,johnajacob/bootstrap,yuyokk/bootstrap,gijsbotje/bootstrap,GerHobbelt/bootstrap,yuyokk/bootstrap,johnajacob/bootstrap,SweetProcess/bootstrap,johnajacob/bootstrap,NCARB/bootstrap,Delagen/bootstrap,davethegr8/bootstrap,9-chirno/chirno,hebbet/bootstrap,lemuelbarango/bootstrap,janseliger/bootstrap,igoynawamreh/bootstrap,andresgalante/bootstrap,n054/bootstrap,tjkohli/bootstrap,slavanga/bootstrap,gijsbotje/bootstrap,Scoutski/bootstrap,realcrowd/bootstrap,peterblazejewicz/bootstrap,IdanCo/bootstrap,vsn4ik/bootstrap,gijsbotje/bootstrap,realcrowd/bootstrap,hebbet/bootstrap,SweetProcess/bootstrap,supergibbs/bootstrap,vsn4ik/bootstrap,stanwmusic/bootstrap,davethegr8/bootstrap,coliff/bootstrap,igoynawamreh/bootstrap,bootstrapbrasil/bootstrap,bootstrapbrasil/bootstrap,afuno/bootstrap,copperdesign/bootstrap,zalog/bootstrap,jipexu/bootstrap,andresgalante/bootstrap,janseliger/bootstrap,afuno/bootstrap,TheFridayInstitute/bootstrap,bardiharborow/bootstrap,peterblazejewicz/bootstrap,andresgalante/bootstrap,JumpLinkNetwork/bootstrap-backward,vsn4ik/bootstrap,stanwmusic/bootstrap,tagliala/bootstrap,coliff/bootstrap,9-chirno/chirno,lemuelbarango/bootstrap,Hemphill/bootstrap-docs,GerHobbelt/bootstrap,NCARB/bootstrap,JumpLinkNetwork/bootstrap-backward,jipexu/bootstrap,fschumann1211/bootstrap,seanwu99/bootstrap,janseliger/bootstrap,joblocal/bootstrap,seanwu99/bootstrap,nice-fungal/bootstrap,tagliala/bootstrap,SweetProcess/bootstrap,afuno/bootstrap,davethegr8/bootstrap,edanbarak/bootstrap,Hemphill/bootstrap-docs,copperdesign/bootstrap,m5o/bootstrap,fschumann1211/bootstrap,TheFridayInstitute/bootstrap,tibo66/bootstrap,inway/bootstrap,hebbet/bootstrap,twbs/bootstrap,Lyricalz/bootstrap,tibo66/bootstrap,kvlsrg/bootstrap,IdanCo/bootstrap,edanbarak/bootstrap,zalog/bootstrap,JumpLinkNetwork/bootstrap-backward,supergibbs/bootstrap,n054/bootstrap,supergibbs/bootstrap,Scoutski/bootstrap,creativewebjp/bootstrap,sealocal/bootstrap,Delagen/bootstrap,tjkohli/bootstrap