[gnome-music] application.css: Workaround black margins bug

[Marinus Schraal <mschraal src gnome org>]

commit c624a9d0ef8d6b8dd1d9e06b44d76ec0f5c6094f
Author: Marinus Schraal <mschraal src gnome org>
Date:   Sat Nov 26 13:15:58 2016 +0100

    application.css: Workaround black margins bug
    
    GtkListBox shows black margins when inside a scrolled window. Setting
    the background to transparent works until the bug in gtk is fixed.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=773459

 data/application.css |    5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)
---
diff --git a/data/application.css b/data/application.css
index 198fc38..afd0850 100644
--- a/data/application.css
+++ b/data/application.css
@@ -11,8 +11,9 @@ flowbox, treeview, widget {
     -gtk-key-bindings: unbind-ctrl-space;
 }
 
-row, list {
-    background-color: @theme_bg_color;
+/* Workaround the black border bug (#773459). */
+list, row {
+    background: transparent;
 }
 
 .discsongsflowbox > flowboxchild {