Add style for dock

Gtkmm3_Mac/res/mydock.ui

@@ -183,17 +183,7 @@
               </packing>
             </child>
             <child>
-              <object class="GtkLabel">
-                <property name="visible">True</property>
-                <property name="can-focus">False</property>
-                <property name="label" translatable="yes">	
-	</property>
-              </object>
-              <packing>
-                <property name="expand">False</property>
-                <property name="fill">True</property>
-                <property name="position">7</property>
-              </packing>
+              <placeholder/>
             </child>
           </object>
           <packing>

Gtkmm3_Mac/src/ui/MyDock.cc

@@ -4,8 +4,17 @@ MyDock::MyDock(BaseObjectType *cobject, const Glib::RefPtr<Gtk::Builder> ref_Gla
 :Gtk::Box(cobject),
 ref_builder(ref_Glade)
 {
+    // Get Widget
     ref_builder->get_widget("finder_box",finder_box);
+    ref_builder->get_widget("dock_box",dock_box);
     finder_box->pack_start(finder);
+
+    // Add Style for MyFinder
+    provider = Gtk::CssProvider::create();
+    provider->load_from_resource("/org/gtk/daleclack/style.css");
+    auto style = dock_box->get_style_context();
+    style->add_provider(provider, G_MAXUINT);
+
     show_all_children();
 }
 

Gtkmm3_Mac/src/ui/MyDock.hh

@@ -11,10 +11,13 @@ public:
 
 private:
     // Child widgets
-    Gtk::Box * finder_box;
+    Gtk::Box *finder_box, *dock_box;
+
     //Finder
     MyFinder finder;
 
+    //Other
     Gtk::Window * parent_win;
     Glib::RefPtr<Gtk::Builder> ref_builder;
+    Glib::RefPtr<Gtk::CssProvider> provider;
 };