TYPO3 Core

Personally, I think it's fine the way it is. Flash messages are temporary and disappear after a few seconds, unless it's an error. I'll redirect this to the UX team.

Hello,

the flash message z-index is good, because it's supposed to be hover anything in the interface, but it's probably the position in the screen that is unusual, and cause this situation. Usually, a flash message or snackbar should stand at the bottom / right of the screen. With a bottom position, it is easy to see and to interact, and it is less likely to interfere with important menus or actions.

Rachel

I have proposed patch, where the alert container is rendered centered. You can test it.
In my opinion it might be better than having it aligned to the upper right corner.
There was also this topis here: https://ux.stackexchange.com/questions/39265/placement-of-flash-growl-notifications-or-messages-in-web-application

Patch set 2 for branch main of project Packages/TYPO3.CMS has been pushed to the review server.
It is available at https://review.typo3.org/c/Packages/TYPO3.CMS/+/81728

Patch set 3 for branch main of project Packages/TYPO3.CMS has been pushed to the review server.
It is available at https://review.typo3.org/c/Packages/TYPO3.CMS/+/81728

Hello Marcin,

Thank you for working on this patch.

Centering the alert container won't solve the problem because other important action button will be hidden according the screen size. A lot of important action buttons or menu are generaly on the top of a screen.

Usually, a flash message or snackbar should stand at the bottom of the screen (bottom / right for large screen, and bottom / center for mobile screen).

Rachel

Patch set 4 for branch main of project Packages/TYPO3.CMS has been pushed to the review server.
It is available at https://review.typo3.org/c/Packages/TYPO3.CMS/+/81728

Patch set 5 for branch main of project Packages/TYPO3.CMS has been pushed to the review server.
It is available at https://review.typo3.org/c/Packages/TYPO3.CMS/+/81728

Patch set 6 for branch main of project Packages/TYPO3.CMS has been pushed to the review server.
It is available at https://review.typo3.org/c/Packages/TYPO3.CMS/+/81728

Patch set 2 for branch 12.4 of project Packages/TYPO3.CMS has been pushed to the review server.
It is available at https://review.typo3.org/c/Packages/TYPO3.CMS/+/81897

Patch set 3 for branch 12.4 of project Packages/TYPO3.CMS has been pushed to the review server.
It is available at https://review.typo3.org/c/Packages/TYPO3.CMS/+/81897