Category talk:MonoBook skin screenshots

I am trying to change the caption text for a wiki page using monobook skin. I editted and saved the CSS page at MediaWiki:Common.css. I specifically edited the caption part of this css file that says

.infobox caption { font-size: 125%; font-weight: bold; font-style: italic; }

and added font-style: italic; because I want to have a different font style. But when I check my wiki pages, they don't show change in font in the caption area. I tried editing other CSS in my mediawiki installation but I'm sure Common.css would implement the change. I'm really stumped. Can somebody help with this?

Peter (in Canada)