Cake own navbar

Hi, thanks in advanced for your help. I’m new in Cake. I’m following a several courses in order to learn tha magic of this Framework. In one of those classes, they talked about to integrate Bootstrap CSS into Cake, to make a NavBar specifically. All went fine, if I remove miligram CSS, the Bootstrap’s NavBar is showed perfectly, but, when I put the miligram CSS, all navbar text change its size. Could Cake have its own NavBar? How? Exist any solution to these CSS confilcts?

Thanks again

Cake has a lot of predefined styles. So when you add your own classes, make sure, that you cover everything you want to change.