UIBinder HTMLPanel: set background color for entire browser window?

GWT 2.5.1, Eclipse 4.2 using GWT plugin (GPE).

I have a Main.ui.xml file thus:

<!DOCTYPE ui:UiBinder SYSTEM "http://dl.google.com/gwt/DTD/xhtml.ent">
<ui:UiBinder xmlns:ui="urn:ui:com.google.gwt.uibinder"
    xmlns:g="urn:import:com.google.gwt.user.client.ui">
   
    <ui:style src='GWTtest.css' />
   
    <g:HTMLPanel stylePrimaryName='{style.main}'>
    <span class='{style.about}'>
        placeholder text
    </span>
    </g:HTMLPanel>
</ui:UiBinder>

The "main" class selector in GWTtest.css specifies only a color -- the color I'd like the browser's page background to be. The page remains white, however. (The span element text renders in the CSS-specified color, so I know the underlying CSS mechanism is working.)

In addition to being new to GWT, I'm pretty shallow in HTML.

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