textbox style wrecked in firefox by VS 2003 (replaces style attrib with height/width)

I have a multiline textbox that shows great in IE (matches what shows in VS design view), but shows way too small in FF.  Under View | Source I could see that the CSS got dropped when serving FF!  So I replaced "asp:textbox height=100 width=100" with "asp:textbox style="height: 100px; width: 100px;", and everything looked great in both browsers!  Until I switched between design and html views in VS.  It replaces my style attribute with the height/width attributes, and goes back to serving the CSS to IE, but not to FF.

Need the CSS served to both browsers, or some way to keep VS from wiping out the CSS I type in the editor.

Thanks for any help/explanations.  

Mike