[gtk+] Adwaita: kill a bogus background-color

[Lapo Calamandrei <lapo src gnome org>]

commit d9ea7cda80e12afbe2abf85be38cfb3a01b550ca
Author: Lapo Calamandrei <calamandrei gmail com>
Date:   Fri Aug 22 13:07:44 2014 +0200

    Adwaita: kill a bogus background-color

 gtk/resources/theme/Adwaita/_common.scss           |    1 -
 gtk/resources/theme/Adwaita/gtk-contained-dark.css |    1 -
 gtk/resources/theme/Adwaita/gtk-contained.css      |    1 -
 3 files changed, 0 insertions(+), 3 deletions(-)
---
diff --git a/gtk/resources/theme/Adwaita/_common.scss b/gtk/resources/theme/Adwaita/_common.scss
index 43e8e68..0af135a 100644
--- a/gtk/resources/theme/Adwaita/_common.scss
+++ b/gtk/resources/theme/Adwaita/_common.scss
@@ -1899,7 +1899,6 @@ GtkCheckButton.text-button, GtkRadioButton.text-button {
       }
       &:backdrop {
         border-color: $osd_borders_color;
-        background-color: none;
         background-image: none;
       }
     }
diff --git a/gtk/resources/theme/Adwaita/gtk-contained-dark.css 
b/gtk/resources/theme/Adwaita/gtk-contained-dark.css
index 3e48044..e9c8729 100644
--- a/gtk/resources/theme/Adwaita/gtk-contained-dark.css
+++ b/gtk/resources/theme/Adwaita/gtk-contained-dark.css
@@ -2329,7 +2329,6 @@ GtkCheckButton.text-button, GtkRadioButton.text-button {
       .scale.scale-has-marks-above.scale-has-marks-below.trough:backdrop, .osd
       .scale.vertical.scale-has-marks-above.scale-has-marks-below.trough:backdrop {
         border-color: rgba(0, 0, 0, 0.7);
-        background-color: none;
         background-image: none; }
 
 .scale.scale-has-marks-below {
diff --git a/gtk/resources/theme/Adwaita/gtk-contained.css b/gtk/resources/theme/Adwaita/gtk-contained.css
index 6322ef2..a8ade8f 100644
--- a/gtk/resources/theme/Adwaita/gtk-contained.css
+++ b/gtk/resources/theme/Adwaita/gtk-contained.css
@@ -2324,7 +2324,6 @@ GtkCheckButton.text-button, GtkRadioButton.text-button {
       .scale.scale-has-marks-above.scale-has-marks-below.trough:backdrop, .osd
       .scale.vertical.scale-has-marks-above.scale-has-marks-below.trough:backdrop {
         border-color: rgba(0, 0, 0, 0.7);
-        background-color: none;
         background-image: none; }
 
 .scale.scale-has-marks-below {