[gnome-themes-standard] notebook: propagate the bg color for viewports inside notebooks

[Cosimo Cecchi <cosimoc src gnome org>]

commit 4888306c315885ae96b67167a03cdbd213e82ed1
Author: Cosimo Cecchi <cosimoc gnome org>
Date:   Mon Oct 24 16:47:53 2011 -0400

    notebook: propagate the bg color for viewports inside notebooks
    
    The notebook doesn't use the standard bg color, so if there's a viewport
    in a notebook page, propagate the different background to it.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=655635

 themes/Adwaita/gtk-3.0/gtk-widgets.css |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)
---
diff --git a/themes/Adwaita/gtk-3.0/gtk-widgets.css b/themes/Adwaita/gtk-3.0/gtk-widgets.css
index 518298e..7bcebaf 100644
--- a/themes/Adwaita/gtk-3.0/gtk-widgets.css
+++ b/themes/Adwaita/gtk-3.0/gtk-widgets.css
@@ -471,6 +471,10 @@ GtkScrolledWindow.frame {
     -GtkNotebook-tab-curvature: 6;
 }
 
+.notebook GtkViewport {
+    background-color: @theme_base_color;
+}
+
 .notebook tab {
     padding: 3;
     background-image: -gtk-gradient (linear,