[gnome-shell] popup-menu: Tweak submenu style

[Owen Taylor <otaylor src gnome org>]

commit a7df1a3d777de94fcf80b0d4a5f2311354f8419f
Author: Jakub Steiner <jimmac gmail com>
Date:   Mon Apr 4 17:38:52 2011 +0200

    popup-menu: Tweak submenu style
    
    Tone down the background color and use an inset shadow to give the
    subsection some depth.
    
    Expander menu item is always highlighted when open.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=646001

 data/theme/gnome-shell.css |    9 ++++++++-
 1 files changed, 8 insertions(+), 1 deletions(-)
---
diff --git a/data/theme/gnome-shell.css b/data/theme/gnome-shell.css
index e058a2a..d540340 100644
--- a/data/theme/gnome-shell.css
+++ b/data/theme/gnome-shell.css
@@ -102,8 +102,15 @@ StTooltip StLabel {
     min-width: 200px;
 }
 
+.popup-submenu-menu-item:open {
+    background-color: #4c4c4c;
+}
+
 .popup-sub-menu {
-    background-color: #606060;
+    background-gradient-start: rgba(80,80,80,0.3);
+    background-gradient-end: rgba(80,80,80,0.7);
+    background-gradient-direction: vertical;
+    box-shadow: inset 0px 2px 4px rgba(0,0,0,0.9);
 }
 
 /* The remaining popup-menu sizing is all done in ems, so that if you