[gtk+] overlay: set css name

[Timm Bäder <baedert src gnome org>]

commit becfd18b07ed9230a68f3f03419dd4a8a0971704
Author: Timm Bäder <mail baedert org>
Date:   Wed Feb 10 14:03:56 2016 +0100

    overlay: set css name

 gtk/gtkoverlay.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/gtk/gtkoverlay.c b/gtk/gtkoverlay.c
index b9208a9..0af10a5 100644
--- a/gtk/gtkoverlay.c
+++ b/gtk/gtkoverlay.c
@@ -804,6 +804,8 @@ gtk_overlay_class_init (GtkOverlayClass *klass)
                   G_TYPE_BOOLEAN, 2,
                   GTK_TYPE_WIDGET,
                   GDK_TYPE_RECTANGLE | G_SIGNAL_TYPE_STATIC_SCOPE);
+
+  gtk_widget_class_set_css_name (widget_class, "overlay");
 }
 
 static void