Why doesn't the framework change from bootstrap?

Question

Bootstrap

I met with such a problem (I'm just learning):
I connected the bootstrap framework. I decided to customize the menu a little, but alas, it does not lend itself to style.css, somehow the framework overlaps its styles. If you dig into the bootstrap document and change the variables there, then ofk everything will change, but I know that I screwed up somewhere, and everything should be superimposed on top of the framework. I added my classes to the nav block, but alas, it did not help. Please help, I broke my whole head ...
ZY . I connected the framework first, then my styles

Answer 1

how exactly did you try to override the styles?
For example, this style: you will not override the usual one or by setting the class to this a and so: you will not override it either. you need to write exactly like bootstrap or longer nesting to override ps in general read about style cascading and style priorities