This is not a CSS solution but I wondered if you were aware of the following:
1. You can create a Category for each author under their name and they can assign that Category to each of their posts. When visitors click the Author's name in the category widget all articles they have published and assigned their name category to will appear.
2. You can use an Author's widget. The widget can display the names or avatars of all your blog’s authors, links to a list of all their former posts, as well as links to posts they’ve recently written. > http://en.support.wordpress.com/widgets/authors-widget/
3. You can use an Author's Grid widget. The widget displays the avatars of all your blog’s authors, which link to a list of posts they’ve each written. http://en.support.wordpress.com/widgets/author-grid-widget/
I know this is not what you are looking for but wanted to share these in case you were not aware of them.