Refinement.

Paper/gtk-3.0/gtk-widgets.css

@@ -44,7 +44,7 @@
 
     outline-color: alpha(#000, 0.2);
     outline-style: dashed;
-    outline-offset: -3px;
+    outline-offset: -2px;
     outline-width: 1px;
     outline-radius: 2px;
 

Paper/gtk-3.0/widgets/buttons.css

@@ -211,6 +211,31 @@ GtkCalendar.button:backdrop:hover,
     color: mix(@backdrop_text, @insensitive_text, 0.5);
 }
 
+/* Labels */
+.text-button GtkLabel {
+    color: @text;
+}
+
+.text-button:active GtkLabel,
+.text-button:focus GtkLabel,
+.text-button:hover GtkLabel {
+    color: shade(@text, 2.0);
+}
+
+.text-button:backdrop GtkLabel,
+.text-button:backdrop:hover GtkLabel,
+.text-button:active:backdrop GtkLabel {
+    color: @backdrop_text;
+}
+
+.text-button:insensitive GtkLabel {
+    color: @insensitive_text;
+}
+
+.text-button:insensitive:backdrop GtkLabel {
+    color: mix(@backdrop_text, @insensitive_text, 0.5);
+}
+
 /**************
 * Help Button *
 **************/

Paper/gtk-3.0/widgets/check-radio.css

@@ -93,37 +93,6 @@ GtkCheckButton:selected:focus {
     color: @backdrop_selected_foreground;
 }
 
-/* Labels */
-.check GtkLabel,
-.check:active GtkLabel,
-.check:focus GtkLabel,
-.check:hover GtkLabel, 
-.radio GtkLabel,
-.radio:active GtkLabel,
-.radio:focus GtkLabel,
-.radio:hover GtkLabel {
-    color: @text;
-}
-
-.check:backdrop GtkLabel,
-.check:backdrop:hover GtkLabel,
-.check:active:backdrop GtkLabel,
-.radio:backdrop GtkLabel,
-.radio:backdrop:hover GtkLabel,
-.radio:active:backdrop GtkLabel {
-    color: @backdrop_text;
-}
-
-.check:insensitive GtkLabel,
-.radio:insensitive GtkLabel {
-    color: @insensitive_text;
-}
-
-.check:insensitive:backdrop GtkLabel,
-.radio:insensitive:backdrop GtkLabel {
-    color: mix(@backdrop_text, @insensitive_text, 0.5);
-}
-
 /* Symbolic Radio */
 .menu .menuitem.radio {
   -gtk-icon-source: -gtk-icontheme("radio-symbolic");

Paper/gtk-3.0/widgets/notebook.css

@@ -68,7 +68,7 @@
 .notebook tab {
     border: none;
     border-radius: 0;
-    background: @background;
+    background: transparent;
     color: @foreground;
 }
 
@@ -79,7 +79,7 @@
 
 .notebook tab:active {
     border: none;
-    background: none;
+    background: transparent;
     color: @foreground;
 }
 
@@ -90,7 +90,7 @@
 
 .notebook tab:backdrop {
     border: none;
-    background: @backdrop_background;
+    background: transparent;
     color: @backdrop_text;
 }