adjust the space between posts in wordpress

I’d like to reduce the space between posts on my website . i’ve searched around here for an answer but the style sheet recommendations i found don’t seem applicable to my theme

images of posts – http://pattukal.site11.com/wordpress/?p=136

Please help me to edit it…………………

Attached style sheet

[code moderated - CSS can easily get retrieved from the linked site - http://codex.wordpress.org/Forum_Welcome#Posting_Code ]