MediaWiki Theme: Don't use 'box-shadow' to produce thin grey lines in dialogs
MediaWiki Theme: Don't use 'box-shadow' to produce thin grey lines in dialogs

At least the Blink rendering engine is wonky and the shadows sometimes
become invisible. Using 'outline' instead, as it doesn't seem to have
these problems and is functionally identical otherwise.

Bug: T85226
Change-Id: I0451ad0736a1e84404cd566157c14e5f2a3b9a4b

wikimedia/oojs-ui,wikimedia/oojs-ui,wikimedia/oojs-ui,wikimedia/oojs-ui