I totally agree with chollida1. This is always the first tutorial I point people at.
Is it possible to add "overflow: scroll" to the code sample blocks' CSS? I get a few characters flow down to the next line which is a bit ugly. A couple of examples:
OK, it's working now on my end. (The trick was changing the font size on code blocks from "85%" to "84%".) Let me know if you still run into any issues.
UPDATE: They actually look fine in Chrome, but not in Firefox! I'm digging into it now.
UPDATE 2: Looks like it's working now