[sushi] Fix close button shadow

[Cosimo Cecchi <cosimoc src gnome org>]

commit d0e7d61f242e4b95f17b2422e9d9292e04fe5525
Author: Trinh Anh Ngoc <atw1990 gmail com>
Date:   Fri Apr 10 23:53:17 2015 +0700

    Fix close button shadow
    
    https://bugzilla.gnome.org/show_bug.cgi?id=747642

 data/style/gtk-style.css |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/data/style/gtk-style.css b/data/style/gtk-style.css
index 4e1b2b0..587aae7 100644
--- a/data/style/gtk-style.css
+++ b/data/style/gtk-style.css
@@ -46,6 +46,7 @@ SushiFontWidget {
     background-color: alpha (#000, 0.0);
 
     -GtkWidget-focus-line-width: 0;
+    box-shadow: none;
 }
 
 .np-decoration.button:hover {