In Boostrap 3 documentation I have found this:
Customize the collapsing point
Depending on the content in your navbar, you might need to change the point at which your navbar switches between collapsed and horizontal mode. Customize the @grid-float-breakpoint variable or add your own media query.
Could I define the @grid-float-breakpoint variable in a main.css file or should I generate a new customized boostrap obligatory?