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CSS

[Question] Responsive.css style questions.

Hello, in the first step of treehouse course "web design", when Nick created the css (Responsive.css) he calls one id #logo and one style for nav in the Media Query (660px). The question is this:

-why he put a width:45% in #logo? -why he put a width:45% in nav?

I've tried do delete them and It seems I don't find any difference, Thank you in advance.