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Menu with max-width, open cart without

Hi, I was wondering if there was a way to have a max-width set to a navigation (containing the cart button), but then have the cart overlay go full-width? (the part that darkens the site content) I’ve played with all sorts of display settings and ill advised techniques like negative margins and setting +100% widths, but nothing seems to work.

If you want to take a look at my site, open your browsers +1440px and open the cart:

Any help is greatly appreciated– thanks!