add volume widget

include/widgets/spacer.hpp

@@ -0,0 +1,17 @@
+#pragma once
+
+#include <gtk4-layer-shell/gtk4-layer-shell.h>
+#include <gtkmm.h>
+#include <gtkmm/label.h>
+
+
+class Spacer : public Gtk::Label 
+{
+  public:
+    Spacer()
+    {
+        set_hexpand(true);
+        set_text("|");
+        set_name("spacer");
+    }
+};