Is it not possible to make the excerpt to an exclusive div?
you could try this - edit bfa_post_parts.php and change line 140 (version 3.7.3) from
?> <div class="my-excerpt"> <?php
?> </div> <?php
this will give you a class called 'my-excerpt' that you can use to style the excerpts content - ie the body of the excerpt.
If you want to style the entire excerpt container you will have to do a lot more and that is beyond the free help avaliable from me on the forum.