diff --git a/src/Semi.Avalonia/Controls/ScrollViewer.axaml b/src/Semi.Avalonia/Controls/ScrollViewer.axaml
index a4096a4..5947061 100644
--- a/src/Semi.Avalonia/Controls/ScrollViewer.axaml
+++ b/src/Semi.Avalonia/Controls/ScrollViewer.axaml
@@ -39,13 +39,7 @@
 
     <ControlTheme x:Key="{x:Type ScrollBar}" TargetType="ScrollBar">
         <Setter Property="Cursor" Value="Arrow" />
-        <Setter Property="Transitions">
-            <Transitions>
-                <DoubleTransition Property="Width" Duration="0:0:0.1" />
-                <DoubleTransition Property="Height" Duration="0:0:0.1" />
-                <!--<TransformOperationsTransition Property="RenderTransform" Duration="0:0:0.1" />-->
-            </Transitions>
-        </Setter>
+        <Setter Property="ShowDelay" Value="0" />
         <Style Selector="^:horizontal">
             <Setter Property="Height" Value="{StaticResource ScrollBarThickness}" />
             <Setter Property="Template">
@@ -187,6 +181,13 @@
             </Setter>
         </Style>
         <Style Selector="^ /template/ Thumb#thumb">
+            <Setter Property="Transitions">
+                <Transitions>
+                    <DoubleTransition Property="Width" Duration="0:0:0.1" />
+                    <DoubleTransition Property="Height" Duration="0:0:0.1" />
+                    <!--<TransformOperationsTransition Property="RenderTransform" Duration="0:0:0.1" />-->
+                </Transitions>
+            </Setter>
             <Setter Property="Foreground" Value="{DynamicResource ScrollBarThumbForeground}" />
             <Setter Property="Template">
                 <ControlTemplate TargetType="Thumb">
@@ -201,12 +202,14 @@
             <Setter Property="Foreground" Value="{DynamicResource ScrollBarThumbPointeroverForeground}" />
         </Style>
         <Style Selector="^:horizontal /template/ Thumb#thumb">
-            <Setter Property="MinWidth" Value="{DynamicResource ScrollBarThickness}" />
+            <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 ScrollBarThickness}" />
+            <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}" />
@@ -222,10 +225,10 @@
             <Style Selector="^ /template/ RepeatButton">
                 <Setter Property="IsVisible" Value="False" />
             </Style>
-            <Style Selector="^:vertical">
+            <Style Selector="^:vertical /template/ Thumb#thumb">
                 <Setter Property="Width" Value="2" />
             </Style>
-            <Style Selector="^:horizontal">
+            <Style Selector="^:horizontal /template/ Thumb#thumb">
                 <Setter Property="Height" Value="2" />
             </Style>
         </Style>
diff --git a/src/Semi.Avalonia/Themes/Shared/ScrollViewer.axaml b/src/Semi.Avalonia/Themes/Shared/ScrollViewer.axaml
index f13b5e8..7e62c4c 100644
--- a/src/Semi.Avalonia/Themes/Shared/ScrollViewer.axaml
+++ b/src/Semi.Avalonia/Themes/Shared/ScrollViewer.axaml
@@ -1,5 +1,6 @@
 <ResourceDictionary xmlns="https://github.com/avaloniaui" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
     <StaticResource x:Key="ScrollBarThickness" ResourceKey="SemiSpacingTight" />
+    <x:Double x:Key="ScrollBarMinLength">24</x:Double>
     <StaticResource x:Key="ScrollBarThumbThickness" ResourceKey="SemiSpacingTight" />
     <StaticResource x:Key="ScrollBarThumbCornerRadius" ResourceKey="SemiBorderRadiusMedium" />
     <StaticResource x:Key="ScrollBarUpGlyph" ResourceKey="SemiIconSmallTriangleTop" />