I agree. It's hard to find the new posts now.

Unfortunately, that doesn't seem to be something that can be modified via CSS. On the index page, the threads with new posts have a different style than threads that do not. On the thread page, the new posts do not seem to have a different style associated with them.

There is supposed to be support for modifying the HTML template in this version of the software. I think that would have to be utilized to make this happen. Unfortunately, I don't know enough about the software to say for sure that even that can help.