I connect the standard bootstrap.css to my site and my own (via Koala compiled from .scss) style.css style file Bootstrap.css interrupts the style.css styles. It should be the other way around. Who knows how to connect the bootstrap correctly, so that he would not interrupt the styles written and compiled on scss?
The style is applied here: Navbar example 
Update
the same screen, only in a different screen resolution (the priority of styles changes again)



