I've built a website in wordpress that has a full width rotating image, animated by jQuery. It works fine, except if you take the screen size from full window to smaller, leave it there for a slide or two, then go back to full-size. You'll notice if you watch the images now, that there will be a white space on the right hand side on some of them.
I don't know the answer to your question, but one thing you will need to check is how those pages show in Google Preview in the SERPs and how they appear when using the WMT Preview Tool. You might have a nasty shock.
To solve your immediate problem, you might want to use a browser extension such as Firebug to investigate the relationship of the various CSS rules with the content.