Styling DataGrid headers

I've configured my DataGrid with a custom CSS file like so:

  public interface UsersDataGridResources extends DataGrid.Resources

  {

    @Source({DataGrid.Style.DEFAULT_CSS,"usersDataGrid.css"})

    DataGrid.Style dataGrid();

  }

  private static final int DEFAULT_PAGE_SIZE = 50;

  private static final UsersDataGridResources usersDataGridResources

    = GWT.create(UsersDataGridResources.class);

  static { usersDataGridResources.dataGrid().ensureInjected(); }

  private DataGrid<User> usersGrid_

    = new DataGrid<User>(DEFAULT_PAGE_SIZE,usersDataGridResources);

I've specified a normal font in usersDataGrid.css:

.dataGridHeader {

  font-weight: normal !important;

  text-decoration: none !important;

}

This isn't being reflected in what I see when the grid is rendered.  I'm specifying the column headers as simple strings, not Cells.  Is there a different property I need to configure?

Thanks,

Patrick

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