Thread:Talk:MediaWiki 1.23/Changes to Common.css and Vector.css don’t affect all pages./reply

Currently not except for creating a custom skin or adapting the standard skins at server level (be cautious when upgrading in the latter case). This behaviour was introduced with 1.19.20, 1.22.12 and 1.13.5 so solve bugzilla::70627. Bug bugzilla::71621 was opened to address your very issue (you are not alone) but this is currently getting anywhere as you can see. Still searching for solutions here.