Is having a large z number bad for design and SEO?

Sorry, I'm a novice so this is all a bit alien to me! I bought a premium WP template and the developer made some adjustments for me. They made the z index 9999999 to add a couple of features but when asking for help regarding a pop up shopping cart with somebody else, they said this was a very bad way to do coding. Is this correct? Does anyone know whether it will affect my SEO? Thanks

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