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Help with full screen mobile nav scrolling

I have my mobile nav come in full screen from the side. I set the logo and hamburger icon z-index to 9999 so it shows through. I don’t know how to make it not scroll through. The only way I’ve found is to make the navbar fixed, but I don’t want it fixed when the menu isn’t open.

Here is my site Read-Only: Webflow - Hair by the beach