diff --git a/src/Semi.Avalonia/Controls/WindowNotificationManager.axaml b/src/Semi.Avalonia/Controls/WindowNotificationManager.axaml
index cfd96ac..74e4b53 100644
--- a/src/Semi.Avalonia/Controls/WindowNotificationManager.axaml
+++ b/src/Semi.Avalonia/Controls/WindowNotificationManager.axaml
@@ -21,6 +21,11 @@
             <Setter Property="HorizontalAlignment" Value="Right" />
         </Style>
 
+        <Style Selector="^:topcenter /template/ ReversibleStackPanel#PART_Items">
+            <Setter Property="VerticalAlignment" Value="Top" />
+            <Setter Property="HorizontalAlignment" Value="Center" />
+        </Style>
+
         <Style Selector="^:bottomleft /template/ ReversibleStackPanel#PART_Items">
             <Setter Property="ReverseOrder" Value="True" />
             <Setter Property="VerticalAlignment" Value="Bottom" />
@@ -32,5 +37,11 @@
             <Setter Property="VerticalAlignment" Value="Bottom" />
             <Setter Property="HorizontalAlignment" Value="Right" />
         </Style>
+
+        <Style Selector="^:bottomcenter /template/ ReversibleStackPanel#PART_Items">
+            <Setter Property="ReverseOrder" Value="True" />
+            <Setter Property="VerticalAlignment" Value="Bottom" />
+            <Setter Property="HorizontalAlignment" Value="Center" />
+        </Style>
     </ControlTheme>
 </ResourceDictionary>