diff --git a/src/Semi.Avalonia/Controls/ScrollViewer.axaml b/src/Semi.Avalonia/Controls/ScrollViewer.axaml
index 6f14991..5947061 100644
--- a/src/Semi.Avalonia/Controls/ScrollViewer.axaml
+++ b/src/Semi.Avalonia/Controls/ScrollViewer.axaml
@@ -204,10 +204,12 @@
         <Style Selector="^:horizontal /template/ Thumb#thumb">
             <Setter Property="MinWidth" Value="{DynamicResource ScrollBarMinLength}" />
             <Setter Property="Height" Value="{DynamicResource ScrollBarThumbThickness}" />
+            <Setter Property="VerticalAlignment" Value="Bottom"/>
         </Style>
         <Style Selector="^:vertical /template/ Thumb#thumb">
             <Setter Property="MinHeight" Value="{DynamicResource ScrollBarMinLength}" />
             <Setter Property="Width" Value="{DynamicResource ScrollBarThumbThickness}" />
+            <Setter Property="HorizontalAlignment" Value="Right"/>
         </Style>
         <Style Selector="^ /template/ RepeatButton > PathIcon">
             <Setter Property="Foreground" Value="{DynamicResource ScrollBarButtonDefaultForeground}" />