I want to make a few changes to the way comments are styled in the mod latest comment box as follows;

1. I want to remove the dual colors used and just use the background color for all.

2. I want to remove the dot in front of each comment which I thick is produced by using (UL) lists.

3. I want to center comments in box.

4. I want to change the font color.

5. I want to add a separator line between comments.

Can someone steer me to the right CSS file and perhaps give me an example on the most difficult ones? I am not very good with CSS.