style.css changes not applying

I have some formatting I want to do to a couple divs in entries and my sidebar, but when I make the changes in my style.css, those changes aren’t being applied.

Specifically: I have a div id=”10Qsb” on one of my test pages right now. Within the stylesheet I created a section
#10Qsb {
font-size:24px;
}
But it’s not making the text in the div any bigger. It’s not just text size either. Any attributes I try to apply are ignored. This is driving me mad, and I have no idea why it is selectively ignoring ids when the rest of the styling on the page works fine.

Here’s the page and the stylesheet.
http://famouspotatoes.net/jjr/?page_id=13
http://famouspotatoes.net/jjr/wp-content/themes/JJR2/style.css

Thanks