[Zope] Plone is neglecting my styles

Hi all, In working with Plone, I'm currently in the throes of creating the template for a portal. The default skin in Plone has a white body, but my ploneCustom.css specifically sets it to grey. But when I view the page rendered by Plone, the background is stil white. ? But wait, there's more - some of the other styles get applied, but not all. Does Plone's stylesheets have the css equivalent of 'reserved words' or what? -- mitchy