Font differences in table

Hi: Wonderful plugin, and it’s exactly what I need. One issue: The font displayed in tables is styled differently than the rest of my site. If you look here http://imgur.com/a/UnbxS the first image is the table style, and the second is the rest of the site. Any idea how I could fix that? Thanks!

http://ww.wp.xz.cn/extend/plugins/websimon-tables/