f91700b77b
The convention to avoid px in font-size and use em instead was added to Wikimedia coding conventions was added in December 2020: https://www.mediawiki.org/wiki/Manual:Coding_conventions/CSS#Don't_rely_on_px_unit_based_values Now it's also enforced using stylelint. This commit changes all CSS font-size values that were still in px to em units.