css/formatting of link that appears in the block

Was just trying to pinpoint where I needed to change the code so I can change the font and/or size of the actual link that brings you to the user/login and starts the fancybox module. I want the "Login" to be just a link in the upper right on my site, but with the settings for my current them, the link is hard to see. I want to play with increasing the font size and a few other settings.

This is the code I see on the page, but I don't see where I can edit/add to the class or do inline css: