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Creating Navmenu

This is a website i am designing. I am facing a issue while creating the nav-menu. Refer the Read-only link to understand the issue.

The navbar contains various elements. Logo, Links, Search and Cart. All elements work fine except the cart button. Whenever i click on it, it appears only in the navbar and not on the whole page. I have tried to change the z-index of the cart but of no use. However when i hide the content-wrapper (check the read-only link), the cart appears perfectly.

Please Help

No strange behaviour here, could you share your live link?