Z Index set to 500 and button still on sitting at the top, why?

A button isnt working because I have a DIV on top of it that I need to keep in that place due to a very complicated interaction i spent weeks on. I have this button Z index set to 500 and it’s still on working. What can I do to get this button to work? It’s the second button on this page labeled “Our Pizza” Thank you!

read only: Webflow - Limoni Belli Website

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