Created by: flavio-b
The.toast-container tries to use the z-index CSS variable, which is defined under .toast.
However, this variable is not accessible to the .toast-container, because it is the parent of .toast. This PR copies the variable to the spot where it can be used.
Fixes #37136 (closed) Fixes #37175 (closed)
I'm not sure how to handle the documentation in this case.