How to set Web Page margin to Zero(0) using GWT

When i'm adding a button to the page using the following code there is
some margin. i'm using GWT 2.4.0



import com.google.gwt.core.client.

EntryPoint;
import com.google.gwt.user.client.ui.Button;
import com.google.gwt.user.client.ui.RootPanel;

public class GWTApplication implements EntryPoint {
       public void onModuleLoad() {
               RootPanel.get().add(new Button("Button"));
      }
}


i don't want the margin in the web page.
Please help me.


Thank you.

--
You received this message because you are subscribed to the Google Groups "Google Web Toolkit" group.
To view this discussion on the web visit https://groups.google.com/d/msg/google-web-toolkit/-/L-4ygc0LIsEJ.
To post to this group, send email to google-web-toolkit@googlegroups.com.
To unsubscribe from this group, send email to google-web-toolkit+unsubscribe@googlegroups.com.
For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en.