Reduce logo size with css
Fragment of a discussion from Project:Support desk
Scaling images is nasty and bad HTML. It's added as background-image of #p-logo a.
Many images can be reduced to the displayed size and still look good. In cases where a higher resolution image is needed, that is when the scaling is necessary. It looks like the only way to increase a logo resolution in MediaWiki would be to rewrite that piece of css so that the logo isn't a background image.
So if anyone knows how to write that code or can give pointers, it would be appreciated.