CSS font-size for entire page

Is it possible to change the font size of the entire body using CSS? Something similar to the <basefont> tag? I tried:

and it doesn't seem to work. How would I go about doing this?

That should work. Are you sure your text isn't inside a table? If it is you could add "td" after body:

Dang you're right. I had set up the whole page in one big <td> cell. I feel so stupid. But I knew it was in a <td> cell because I ended up just puting the font-size property on the <td> anyway. Thanks for the extremely quick response. Even though I already have it working, it's good to know that it does work with body. Didn't make much sense that it didn't...