WPBeginner.com has a great tutorial on how to style the WordPress comment form as well as the layout of the comments. Most of the changes are simple CSS edits but determining where those CSS attributes are located can sometimes be harder than making the edits. Their guide shows you how to add buttons to the Edit, Cancel, and Reply links using only CSS properties.
Speaking of styling comments, how many of you remember a service called CommentBits? CommentBits was an entire business built around the styling of comments in 2009 by Ryan Imel. In an interview I conducted with him, my thought was at the time that he would be able to create a nice niche for himself within a big market. However, things stagnated very quickly with a lack of new designs released. Even though the purchase link still appears to work, I’d be hesitant of purchasing anything through the site. I wonder though if something like CommentBits would be successful in today’s WordPress theme market?