If you look at the top left corner of this window, you will a transparent green arrow button right above the transparent border. If you highlight this with your mouse, it shows up clearly. Click it to hide this window so you can see the beautiful backgrounds in their entirety. Click it again to bring back the content. Give it a whirl!

*UPDATE*

It was brought to my attention that the button wasn't working in Internet Explorer. Cross-browser support is annoying, but at least it's working now. Thanks goes out to Jason.