HELP with Blockquote spacing

Hello! I recently tweaked my blockquote code and I’m very happy with the way it looks. However, there is a huge space after every quote.

For example in this post; http://www.thebookishowl.net/?p=3079 you can see that the quote “That was the thing about secrets-you had to carry them with you forever, no matter what the cost.” has a HUGE space underneath it. How do I remove this space?

Thank you and I appreciate your help