Hi @GlebPlakhotnik,
I see your point; so far we didn’t put a stacking context on #content, because there’re some cases of legitimate elements inside #content overlapping the app header and we haven’t found issues in the UI without it.
In general, regular UI elements (ie. not modals, flags, etc.) follows the following z-index values:
app header (4) > sidebar (3) > sticky headers (2) > some components / elements on a page (1) > the rest
To my understanding many extensions of the UI don’t need to deal with z-index at all. In case of more sophisticated logic / bigger piece of the UI one can put its own stacking context in order to isolate that part from the rest of the application.
Could you share examples / your use cases that are affected?
Best,
Jira Team