Modifying default GWT CSS styles with UiBinder and ClientBundle

I want to use default CSS styles with UiBinder and ClientBundle (e.g. .gwt-DecoratedTabBar, etc.), but I get a compile error when I make a Resources interface which extends ClientBundle, with @Source("my_css.css") before my CssResource field.  The only way I have found to get around that is to use @NotStrict before the @Source annotation.  But when I read through the docs it seems to imply that @NotStrict is not the best way to do this.  Is there another, more "approved" method to use modified GWT CSS classes within ClientBundle?

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