How to stop navigation bar from resizing?

I'm using the blog-site skeleton and i want to change the behaviour of the navigation bar so that it will not resize if the user scrolls down. I don't know where to change that. Could someone please guide me here?

Hello
the effect you would like to change is made by css formatting and a little script in java that add a scrolled class that outputs the resize effect.
Change css and you will be able to do what you want with the appearence of navigation bar.
Check first also learn.getgrav.org to see how to compile decompile css.
It is not easy at first if you are not familiar but you'll learn a lot and it's passionnating.
Good luck!

Thanks! Will look into it :)