MediaWiki theme: Add filled white background to toolbars
MediaWiki theme: Add filled white background to toolbars

For floating toolbars.

Change-Id: Ia54799b08237f7f86a1f09195b5f5da0513a2e8f

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