fix: fixing possible default z-index problems

[marvinLaubenstein]

⚠️ Please check if this is wanted like this before merging.

current status: with changed z-index by variable:

I noticed a problem with the fixed z-indexes (compare screenshot). I think it can definitely be useful for the user of the component if he can set the z-index variably.

In the variables I have set the old values as default these change nothing and could also be 0. But someone has certainly thought something with the values.

[render[bot]]

Your Render PR Server URL is https://scale-storybook-staging-pr-1090.onrender.com.

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[render[bot]]

Your Render PR Server URL is https://telekom-scale-storybook-preview-pr-1090.onrender.com.

Follow its progress at https://dashboard.render.com/static/srv-cdg026un6mpouohib5kg.

[nowseemee]

@acstll do you approve?

[acstll]

Will also take a look @nowseemee — sorry I missed the mention (I need to fix my email/notification/etc.) 😅

[acstll]

done… @marvinLaubenstein LGTM