In the latest versions of gnome-shell the power-off/restart dialog has been split into separate dialogs (compare Ubuntu 20.04 with 21.10). Along with the log-out dialog they are all themed by the entries for end-session-dialog in gnome-shell.css. Do the individual dialogs have names so that they can be themed independently, e.g. the last-child could have a different background color in each?
To make my intentions clear, here are images of what I would like to have. In each case it's the background color of the last child that is different. With just the end-session-dialog modified all three dialogs will have the same background color for each component.
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