File themes-csd-titlebar-fix.patch of Package ubuntu-themes

--- a/Ambiance/gtk-3.0/gtk-widgets.css
+++ b/Ambiance/gtk-3.0/gtk-widgets.css
@@ -53,7 +53,7 @@
     background-clip: padding-box;
 }
 
-.background {
+.titlebar, .background {
     color: @fg_color;
     background-color: @bg_color;
 }

--- a/Radiance/gtk-3.0/gtk-widgets.css
+++ b/Radiance/gtk-3.0/gtk-widgets.css
@@ -52,7 +52,7 @@
     background-clip: padding-box;
 }
 
-.background {
+.titlebar, .background {
     color: @fg_color;
     background-color: @bg_color;
 }