more CSD fixes

src/usr/share/themes/Lubuntu-default/gtk-3.0/gtk-main.css

@@ -28,9 +28,8 @@
 @define-color button_bg_color shade (@bg_color, 1.02); /*shade (#cdcdcd, 1.08);*/
 @define-color notebook_button_bg_color shade (@bg_color, 1.02);
 @define-color button_insensitive_bg_color mix (@button_bg_color, @bg_color, 0.6);
-@define-color dark_bg_color #e0e0e0;
+@define-color dark_bg_color #d0d0d0;
 @define-color dark_fg_color @fg_color;
-@define-color borders @dark_bg_color;
 @define-color transparent rgba (0, 0, 0, 0);
 
 @define-color backdrop_fg_color mix (@bg_color, @fg_color, 0.8);
@@ -39,6 +38,13 @@
 @define-color backdrop_selected_bg_color shade (@bg_color, 0.92);
 @define-color backdrop_selected_fg_color @fg_color;
 
+@define-color focus_color alpha (@selected_bg_color, 0.5);
+@define-color focus_bg_color alpha (@selected_bg_color, 0.1);
+@define-color shadow_color alpha(black, 0.5);
+@define-color osd_fg_color #eeeeec;
+@define-color osd_bg_color alpha(#202526, 0.7);
+@define-color osd_border_color alpha(black, 0.7);
+
 @define-color scrollslider_gradient_a #bdbdbd;
 @define-color scrollslider_gradient_b #bdbdbd;
 @define-color scrollslider_border #bdbdbd;