I'm currently designing a website with K2 articles, but I would really like to customize their layout, further than available with the simple options as number of columns in the primary, secondary, display of author name or not, etc. (the things you can easily do with the options available under the K2 extension).
What I want to do is center the articles (e.g. that the article appears in the center column if there are 3 columns and only one article), as well as their titles (in the article overview they're all left-aligned); as well as ideally add a title above the primary, secondary, .... articles.
Is that possible somehow, maybe by modifying the k2.css file ? If yes, in which way ? Help please.