[libadwaita/wip/exalm/buttons-5: 9/20] stylesheet: Use flat button style for calendar header

[Alexander Mikhaylenko <alexm src gnome org>]

commit 9015fb6ebfeeb9011df1941402decba88ab6c432
Author: Alexander Mikhaylenko <alexm gnome org>
Date:   Thu Jun 10 22:11:49 2021 +0500

    stylesheet: Use flat button style for calendar header

 src/stylesheet/widgets/_calendar.scss | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)
---
diff --git a/src/stylesheet/widgets/_calendar.scss b/src/stylesheet/widgets/_calendar.scss
index 89b535e2..7fce9169 100644
--- a/src/stylesheet/widgets/_calendar.scss
+++ b/src/stylesheet/widgets/_calendar.scss
@@ -6,9 +6,7 @@ calendar {
     border-bottom: 1px solid $borders_color;
 
     > button {
-      border: none;
-      background: none;
-      box-shadow: none;
+      @extend %button_basic_flat;
       border-radius: 0;
     }
   }