[gtk/wip/baedert/for-master: 12/13] Adwaita: Fix calendar header button backdrop bg color

[Timm Bäder <baedert src gnome org>]

commit 9c91a3a165217e68c25d1b50a08dd53b47af724a
Author: Timm Bäder <mail baedert org>
Date:   Wed Sep 23 05:58:40 2020 +0200

    Adwaita: Fix calendar header button backdrop bg color

 gtk/theme/Adwaita/_common.scss | 3 +++
 1 file changed, 3 insertions(+)
---
diff --git a/gtk/theme/Adwaita/_common.scss b/gtk/theme/Adwaita/_common.scss
index 7ffc6f2f2f..001b170cd0 100644
--- a/gtk/theme/Adwaita/_common.scss
+++ b/gtk/theme/Adwaita/_common.scss
@@ -3254,6 +3254,9 @@ calendar {
       background: none;
       border-radius: 0;
     }
+    > button:backdrop {
+      background: none;
+    }
   }
 
   > grid {