[gnome-calendar] css: remove year-view button superfluous side border.

[Lapo Calamandrei <lapo src gnome org>]

commit e54b023f0603913e9b3f496d176ac3fafd46f206
Author: Lapo Calamandrei <calamandrei gmail com>
Date:   Fri Jul 8 01:09:17 2016 +0200

    css: remove year-view button superfluous side border.

 data/theme/gtk-styles.css |   19 ++++++++++++++-----
 1 files changed, 14 insertions(+), 5 deletions(-)
---
diff --git a/data/theme/gtk-styles.css b/data/theme/gtk-styles.css
index ddfe7f9..e7aa29e 100644
--- a/data/theme/gtk-styles.css
+++ b/data/theme/gtk-styles.css
@@ -173,13 +173,22 @@ calendar-view.second-view-header {
     border-right-style: solid;
 }
 
-.year-view scrolledwindow {
-    border-top-width: 0;
-    border-bottom-width: 0;
-}
-
 .year-view button {
     border-radius: 0;
+    border-bottom-style: none;
+}
+
+.year-view button:dir(ltr) {
+    border-right-style: none;
+}
+
+.year-view button:dir(rtl) {
+    border-left-style: none;
+}
+
+
+.year-view scrolledwindow {
+    border-top-width: 0;
     border-bottom-width: 0;
 }