Mobile: remove product confirmation modal displays out of viewport

[KFie]

Environment: mobile (here: Nokia 7.1, Android 10; iPhone 12 mini, iOS 16.3.1)

Reproduce:

1. Add random item to cart
2. Open cart
3. Click delete icon

Issue: note the remove product confirmation modal displays on the very top of the page, thus it is not within the user's viewport.

On iPhone 12 mini, iOS 16.3.1., the modal is visible but doesn't have the correct shape:

iOS:

Android:

[freddyka]

Issue not fixed for poster v2.1.

-->reason is that mobile menu button can't be used (see#199)

[EliasTatX]

The issue is still open as of v2.2. While, unlike before, the top navigation on mobile works in v2.2 which allows normal navigation to this element this is unrelated to the issue. The modal displays at the top of the current FoV meaning it is always in sight of the user. However in portrait view (horizontal orientation) it is still not intuitive to see the modal on the top as opposed to where one clicked on the remove button.