diff -upr nemo-2.8.6/src/nemo-window.c nemo-2.8.6-test/src/nemo-window.c
--- nemo-2.8.6/src/nemo-window.c	2015-11-27 11:00:22.000000000 +0100
+++ nemo-2.8.6-test/src/nemo-window.c	2016-02-13 22:13:11.907508549 +0100
@@ -2066,6 +2066,11 @@ nemo_window_init (NemoWindow *window)
 
 	window->details = G_TYPE_INSTANCE_GET_PRIVATE (window, NEMO_TYPE_WINDOW, NemoWindowDetails);
 
+    GtkStyleContext *context;
+
+    context = gtk_widget_get_style_context (GTK_WIDGET (window));
+    gtk_style_context_add_class (context, "nemo-window");
+
 	window->details->panes = NULL;
 	window->details->active_pane = NULL;
 
diff -upr nemo-2.8.6/src/nemo-window-pane.c nemo-2.8.6-test/src/nemo-window-pane.c
--- nemo-2.8.6/src/nemo-window-pane.c	2015-11-27 11:00:22.000000000 +0100
+++ nemo-2.8.6-test/src/nemo-window-pane.c	2016-02-13 22:35:49.996213630 +0100
@@ -983,6 +983,11 @@ nemo_window_pane_init (NemoWindowPane *p
 	pane->active_slot = NULL;
 
 	gtk_orientable_set_orientation (GTK_ORIENTABLE (pane), GTK_ORIENTATION_VERTICAL);
+
+	GtkStyleContext *context;
+
+	context = gtk_widget_get_style_context (GTK_WIDGET (pane));
+	gtk_style_context_add_class (context, "nemo-window-pane");
 }
 
 NemoWindowPane *