I still don't see problem on your screenshot. Sticky panel with button has priority so it will be above other items, it's expected

Merhaba, ürün sayfasındaki bu bildirimi nasıl kapatabilirim?

Your question was not about z-index

please provide details which z index you change and what is overlapping 

Hello, no matter how much we increase the Z Index value, other elements still overlap it. How do you think I can solve this problem? Thank you.

How to change the color of the card icon? I couldn't see an additional color option. I'm using the Elementor page editor. I added theme elements and selected the cart button, and there was no color change option for this block.