Full-width Product image with Tiny Slider 2

I am learning to use Shopware 6, I am unable to affect the z-index of the product image (in the slider) to bring it forward and make it display in full-width.

My approach would usually be edit the CSS files in order to get what I need, but in this case it does not seems to work.

Would you guys recommend to spend some more time trying to manipulate the the CSS to achieve the goal - Or would you rather recommend to focus on the Tiny Slider 2 functioning?