Z-index content page

We are having difficulty getting z-index to work ion this page (which is a content page inside a layout).
https://development.scatbags.com/shop

The image should be at the back but we can’t seem to get it to go behind the menu (the menu is part of our layout page and should always be on top of the content. The buttons on the content page should also be behind.

We did not use a modal because it is not suitable for our needs.

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