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Fixed bottom - Problem with elements overlaying

Hi there!

On my website I set up a fixed bottom section in orange color, sort of a cookie banner.

My problem is, that some other page elements show above it e.g. some pictures and some headlines, when I scroll. But they should all be underneath. Which setting am I missing? Can anyone help please?

Thanks, Nina

Here is my link:
https://preview.webflow.com/preview/businesssquare-kaarst?utm_medium=preview_link&utm_source=designer&utm_content=businesssquare-kaarst&preview=b80521b3d375bfc695cc51a50f893da4&workflow=preview