The styling for the editOptions box when editing a page only really applies to Vector and similar skins, but it's in a global file and loaded after the skin css - so not only does it apply to all skins, it even overrides the styling of other skins unless you add some messy selectors to override the override.
It should probably just be in the shared css for Vector/MonoBook instead.
Version: 1.23.0
Severity: normal