[gnome-builder] style: fix stacks containing headerbar

[Christian Hergert <chergert src gnome org>]

commit f9e7688b2faa09dc6cbdc67ae788f9a0b43446ec
Author: Christian Hergert <christian hergert me>
Date:   Fri Dec 18 20:22:36 2015 -0800

    style: fix stacks containing headerbar

 data/theme/shared.css |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)
---
diff --git a/data/theme/shared.css b/data/theme/shared.css
index e6e0f9e..9422fa3 100644
--- a/data/theme/shared.css
+++ b/data/theme/shared.css
@@ -23,6 +23,12 @@
 }
 
 
+stack.titlebar {
+  padding: 0 0 0 0;
+  border-bottom: none;
+}
+
+
 GbEditorSettingsWidget row {
   padding: 6px;
   border-bottom: 1px solid @borders;