* The Minerva repository has a ".mw-ref" style which is Cite-specific
so that makes be wonder if the expectation is for this to be in
that file instead. That would be a really simple fix and be attached
to the rule for sup as an extra selector.
* But, it seems like Cite extension is the right place for this.
* Found while trying to test Cite rendering with MFE.
Notes:
* This mirrors the style added in
Ieb91c1251839ff4bb54451aae69af9fb88322219
Change-Id: Iae1d391ef11e53110bfb758d45a0fbdf2addf62e
