[gtk+] Adwaita: fix a typo

[Lapo Calamandrei <lapo src gnome org>]

commit 035ce8f18d7b472a20cf1ced7c1348c4390aac18
Author: Lapo Calamandrei <calamandrei gmail com>
Date:   Sat Mar 5 01:50:18 2016 +0100

    Adwaita: fix a typo

 gtk/theme/Adwaita/_common.scss           |    2 +-
 gtk/theme/Adwaita/gtk-contained-dark.css |    2 +-
 gtk/theme/Adwaita/gtk-contained.css      |    2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)
---
diff --git a/gtk/theme/Adwaita/_common.scss b/gtk/theme/Adwaita/_common.scss
index 08be694..551e6f2 100644
--- a/gtk/theme/Adwaita/_common.scss
+++ b/gtk/theme/Adwaita/_common.scss
@@ -2039,7 +2039,7 @@ scrollbar {
 
   &:backdrop {
     background-color: $backdrop_scrollbar_bg_color;
-    border-color: backdrop_borders_color;
+    border-color: $backdrop_borders_color;
   }
 
   // slider
diff --git a/gtk/theme/Adwaita/gtk-contained-dark.css b/gtk/theme/Adwaita/gtk-contained-dark.css
index b5dbb17..ab033bd 100644
--- a/gtk/theme/Adwaita/gtk-contained-dark.css
+++ b/gtk/theme/Adwaita/gtk-contained-dark.css
@@ -2193,7 +2193,7 @@ scrollbar {
     border-left: 1px solid #1c1f1f; }
   scrollbar:backdrop {
     background-color: #323737;
-    border-color: backdrop_borders_color; }
+    border-color: #1f2222; }
   scrollbar slider {
     min-width: 8px;
     min-height: 8px;
diff --git a/gtk/theme/Adwaita/gtk-contained.css b/gtk/theme/Adwaita/gtk-contained.css
index d34513b..aa42248 100644
--- a/gtk/theme/Adwaita/gtk-contained.css
+++ b/gtk/theme/Adwaita/gtk-contained.css
@@ -2203,7 +2203,7 @@ scrollbar {
     border-left: 1px solid #9d9d99; }
   scrollbar:backdrop {
     background-color: #e1e1df;
-    border-color: backdrop_borders_color; }
+    border-color: #a5a5a1; }
   scrollbar slider {
     min-width: 8px;
     min-height: 8px;