Add removed code back in

SkyfallDarkTeal/gtk-3.0/mate-applications.css

@@ -617,7 +617,19 @@ window.background.mate-terminal > box.vertical > notebook > header.top tab:check
 /***********************
  * mate-volume-control *
  ***********************/
+/* application notebook page */
+GvcMixerDialog notebook.frame scrolledwindow {
 
+    border-style: none;
+    }
+   /* override previous setting */
+GvcMixerDialog notebook.frame box scrolledwindow.frame {
+    border-style: solid;
+    border-color: @border_color;
+    border-width: 1px;
+    border-radius: 2px;
+    padding: 0;
+}
 .mate-panel-applet-slider.background {
     background: solid;
     background-color: transparent;