diff --git a/gtk/resources/theme/Adwaita/_common.scss b/gtk/resources/theme/Adwaita/_common.scss
index 76dd2e8dd9..77a8680984 100644
--- a/gtk/resources/theme/Adwaita/_common.scss
+++ b/gtk/resources/theme/Adwaita/_common.scss
@@ -2427,11 +2427,11 @@ GtkCalendar {
       &:last-child { @extend %last_button; }
     }
     %middle_button {
+      border-left-style: solid;
       border-right-style: none;
       border-bottom-style: none;
     }
     %last_button { 
-      border-left-style: solid;
       border-bottom-right-radius: 7px; 
     }
     %first_button {
diff --git a/gtk/resources/theme/Adwaita/gtk-contained-dark.css b/gtk/resources/theme/Adwaita/gtk-contained-dark.css
index 2a81b3909f..ac5d2fadbf 100644
--- a/gtk/resources/theme/Adwaita/gtk-contained-dark.css
+++ b/gtk/resources/theme/Adwaita/gtk-contained-dark.css
@@ -3293,10 +3293,10 @@ GtkCalendar {
         .message-dialog.csd .dialog-action-area .button.destructive-action:insensitive > GtkLabel {
           color: inherit; }
   .message-dialog.csd .dialog-action-area .button, .message-dialog.csd .dialog-action-area .button:hover, .message-dialog.csd .dialog-action-area .button:active, .message-dialog.csd .dialog-action-area .button:insensitive, .message-dialog.csd .dialog-action-area .button:backdrop, .message-dialog.csd .dialog-action-area .button:backdrop:insensitive, .message-dialog.csd .dialog-action-area .button.suggested-action, .message-dialog.csd .dialog-action-area .button.suggested-action:hover, .message-dialog.csd .dialog-action-area .button.suggested-action:active, .message-dialog.csd .dialog-action-area .button.suggested-action:backdrop, .message-dialog.csd .dialog-action-area .button.suggested-action:backdrop:insensitive, .message-dialog.csd .dialog-action-area .button.suggested-action:insensitive, .message-dialog.csd .dialog-action-area .button.destructive-action, .message-dialog.csd .dialog-action-area .button.destructive-action:hover, .message-dialog.csd .dialog-action-area .button.destructive-action:active, .message-dialog.csd .dialog-action-area .button.destructive-action:backdrop, .message-dialog.csd .dialog-action-area .button.destructive-action:backdrop:insensitive, .message-dialog.csd .dialog-action-area .button.destructive-action:insensitive {
+    border-left-style: solid;
     border-right-style: none;
     border-bottom-style: none; }
   .message-dialog.csd .dialog-action-area .button:last-child {
-    border-left-style: solid;
     border-bottom-right-radius: 7px; }
   .message-dialog.csd .dialog-action-area .button:first-child {
     border-left-style: none;
diff --git a/gtk/resources/theme/Adwaita/gtk-contained.css b/gtk/resources/theme/Adwaita/gtk-contained.css
index f38c15caeb..723048db06 100644
--- a/gtk/resources/theme/Adwaita/gtk-contained.css
+++ b/gtk/resources/theme/Adwaita/gtk-contained.css
@@ -3440,10 +3440,10 @@ GtkCalendar {
         .message-dialog.csd .dialog-action-area .button.destructive-action:insensitive > GtkLabel {
           color: inherit; }
   .message-dialog.csd .dialog-action-area .button, .message-dialog.csd .dialog-action-area .button:hover, .message-dialog.csd .dialog-action-area .button:active, .message-dialog.csd .dialog-action-area .button:insensitive, .message-dialog.csd .dialog-action-area .button:backdrop, .message-dialog.csd .dialog-action-area .button:backdrop:insensitive, .message-dialog.csd .dialog-action-area .button.suggested-action, .message-dialog.csd .dialog-action-area .button.suggested-action:hover, .message-dialog.csd .dialog-action-area .button.suggested-action:active, .message-dialog.csd .dialog-action-area .button.suggested-action:backdrop, .message-dialog.csd .dialog-action-area .button.suggested-action:backdrop:insensitive, .message-dialog.csd .dialog-action-area .button.suggested-action:insensitive, .message-dialog.csd .dialog-action-area .button.destructive-action, .message-dialog.csd .dialog-action-area .button.destructive-action:hover, .message-dialog.csd .dialog-action-area .button.destructive-action:active, .message-dialog.csd .dialog-action-area .button.destructive-action:backdrop, .message-dialog.csd .dialog-action-area .button.destructive-action:backdrop:insensitive, .message-dialog.csd .dialog-action-area .button.destructive-action:insensitive {
+    border-left-style: solid;
     border-right-style: none;
     border-bottom-style: none; }
   .message-dialog.csd .dialog-action-area .button:last-child {
-    border-left-style: solid;
     border-bottom-right-radius: 7px; }
   .message-dialog.csd .dialog-action-area .button:first-child {
     border-left-style: none;