Transparency on Catch Responsive Pro

Hi there URL: http://www.craftbeerchats.com/blog Challenge: Is there a way to set the background color of the header, wrapper, content, main page, posts, etc... to be transparent ? I have tried several custom CSS entries that were posted and some of them did change certain pieces, but for instance, I could not set the wrapper to transparent. Hence even if I set .hentry to transparent, it kept the white (or whatever background color I had set) for the wrapper I have set all backgrounds I am referring to as light yellow for now. Thanks for the help