I have an odd redline next to my logo, and I can't for the life of me work out why.

Take a look: 
<http://www.pdf-explode.com.au/index.php>

Here's the red line I'm talking about:
<http://www.bounceapp.com/66618>

* I've tried looking at all the borders, there's no red.
* searched through backgrounds, no red.
* inspector can't inspect it.
* it's not in the image

Let me know if you can find it.