Question : css white typeface appearing bolder?

Hi there - I have a css-styled horizontal nav bar on a site i'm building.  Currently the white text is set to 'normal' as opposed to 'bold'.  But it is appearing bold looking.
Maybe there's something in the default coding that's automatically adding a "trap allowance". Take a look here and curious as to why this is occurring and if there is way to adjust? Mouse over the links on top and you'll see the difference from white text to red... any insight would be great!
Thanks!

http://www.e-buzzsolutions.com/clients/km

-Crissy

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