Hi @JoLu,
If I understand correct your wish, I think i know how to help you.
In this case navbar (don’t really know why there are 2 of them) sitting inside the wrapper, which has width 95% of the body. So navbar will not fit page width in this way.
If yo want navbar having full width you will have to move it out of “wrapper” or change wrapper size.
About menu-links. In such situation I am using % width for the links. For examples, you have 10 links, so make menu-link width 9.5% and 0.25% left and right margins. Also sometimes I am using VW for font size, which makes font size depended on screen width.
Hope it helps.
Cheers,
Anna.