Check

Dictionary1.xaml

@@ -25,7 +25,7 @@
        
         <Setter Property="VerticalAlignment" Value="Center"/>
         <Setter Property="HorizontalAlignment" Value="Center"/>
-        <Setter Property="Margin" Value="5"/>
+        <Setter Property="Margin" Value="4"/>
     </Style>
 
 </ResourceDictionary>