Forum:Changing default link colors on all pages with CSS

Hi all, I'm trying to change the default link colors on my wikia. I have extremely basic knowledge of CSS, I know the gist of how it works but I'm not that great with it (hence this topic). I tried editing the common css page with the standard css link definitions (a:link, etc), but it didn't seem to alter the page. Looking at a page's source shows that the main content isn't even contained within a div, and there's no css include before the content, so I'm not sure how this is possible? Also, how do you define the color of links that do not have articles yet (default red)?

Thanks.