I created a customized menu the header of my site - for it to work, I created a new stipped-down stylesheet and linked to it. (With the original stylesheet, the original styles were interfering with the layout and function of my menu. I couldn't track them all down to change them). Now my menu looks like I want it to look, but the rest of the site isn't formatted. Is there any way to use my new stylesheet (menustyle.css) just for the header, and then use the responsive child stylesheet starting with the body? I don't mind if they both are applied to the body section, I just don't want all of the imported styles applied to the menu.
I'm new to wordpress, and this is the only way I can figure out to use the theme stylesheet while still having the menu appear correctly. Help?