diff --git a/src/Avalonia.Themes.Fluent/Controls/TabStrip.xaml b/src/Avalonia.Themes.Fluent/Controls/TabStrip.xaml
index 15c3ba2f37..59cb7f6752 100644
--- a/src/Avalonia.Themes.Fluent/Controls/TabStrip.xaml
+++ b/src/Avalonia.Themes.Fluent/Controls/TabStrip.xaml
@@ -1,34 +1,34 @@
 <ResourceDictionary xmlns="https://github.com/avaloniaui"
                     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
-    <Design.PreviewWith>
-      <Border Padding="20">
-        <TabStrip>
-          <TabStripItem>Item 1</TabStripItem>
-          <TabStripItem>Item 2</TabStripItem>
-          <TabStripItem IsEnabled="False">Disabled</TabStripItem>
-        </TabStrip>
-      </Border>
-    </Design.PreviewWith>
-  
-    <ControlTheme x:Key="{x:Type TabStrip}" TargetType="TabStrip">
-      <Setter Property="Template">
-        <ControlTemplate>
-          <Border Background="{TemplateBinding Background}"
-                  BorderBrush="{TemplateBinding BorderBrush}"
-                  BorderThickness="{TemplateBinding BorderThickness}"
-                  CornerRadius="{TemplateBinding CornerRadius}"
-                  Padding="{TemplateBinding Padding}">
-            <ItemsPresenter Name="PART_ItemsPresenter"
-                            Items="{TemplateBinding Items}"
-                            ItemsPanel="{TemplateBinding ItemsPanel}"
-                            ItemTemplate="{TemplateBinding ItemTemplate}" />
-          </Border>
-        </ControlTemplate>
-      </Setter>
-      <Setter Property="ItemsPanel">
-        <ItemsPanelTemplate>
-          <WrapPanel />
-        </ItemsPanelTemplate>
-      </Setter>
-    </ControlTheme>
+  <Design.PreviewWith>
+    <Border Padding="20">
+      <TabStrip>
+        <TabStripItem>Item 1</TabStripItem>
+        <TabStripItem>Item 2</TabStripItem>
+        <TabStripItem IsEnabled="False">Disabled</TabStripItem>
+      </TabStrip>
+    </Border>
+  </Design.PreviewWith>
+
+  <ControlTheme x:Key="{x:Type TabStrip}" TargetType="TabStrip">
+    <Setter Property="Template">
+      <ControlTemplate>
+        <Border Background="{TemplateBinding Background}"
+                BorderBrush="{TemplateBinding BorderBrush}"
+                BorderThickness="{TemplateBinding BorderThickness}"
+                CornerRadius="{TemplateBinding CornerRadius}"
+                Padding="{TemplateBinding Padding}">
+          <ItemsPresenter Name="PART_ItemsPresenter"
+                          Items="{TemplateBinding Items}"
+                          ItemsPanel="{TemplateBinding ItemsPanel}"
+                          ItemTemplate="{TemplateBinding ItemTemplate}" />
+        </Border>
+      </ControlTemplate>
+    </Setter>
+    <Setter Property="ItemsPanel">
+      <ItemsPanelTemplate>
+        <WrapPanel />
+      </ItemsPanelTemplate>
+    </Setter>
+  </ControlTheme>
 </ResourceDictionary>
diff --git a/src/Avalonia.Themes.Fluent/Controls/TabStripItem.xaml b/src/Avalonia.Themes.Fluent/Controls/TabStripItem.xaml
index 5ccd430d33..fab8ba87aa 100644
--- a/src/Avalonia.Themes.Fluent/Controls/TabStripItem.xaml
+++ b/src/Avalonia.Themes.Fluent/Controls/TabStripItem.xaml
@@ -2,107 +2,97 @@
     xmlns="https://github.com/avaloniaui"
     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
     x:CompileBindings="True">
-     <Design.PreviewWith>
-      <Border Padding="20">
-        <StackPanel Spacing="20">
-          <TabStripItem>Leaf</TabStripItem>
-          <TabStripItem IsSelected="True">Arch</TabStripItem>
-        </StackPanel>
-      </Border>
-    </Design.PreviewWith>
-  
-    <x:Double x:Key="TabStripItemMinHeight">48</x:Double>
-    <x:Double x:Key="TabStripItemPipeThickness">2</x:Double>
+  <Design.PreviewWith>
+    <Border Padding="20">
+      <StackPanel Spacing="20">
+        <TabStripItem>Leaf</TabStripItem>
+        <TabStripItem IsSelected="True">Arch</TabStripItem>
+        <TabStripItem Background="Yellow">Background</TabStripItem>
+      </StackPanel>
+    </Border>
+  </Design.PreviewWith>
 
-    <ControlTheme x:Key="{x:Type TabStripItem}" TargetType="TabStripItem">
-        <Setter Property="FontSize" Value="{DynamicResource TabItemHeaderFontSize}" />
-        <Setter Property="FontWeight" Value="{DynamicResource TabItemHeaderThemeFontWeight}" />
-        <Setter Property="Background" Value="{DynamicResource TabItemHeaderBackgroundUnselected}" />
-        <Setter Property="Foreground" Value="{DynamicResource TabItemHeaderForegroundUnselected}" />
-        <Setter Property="Padding" Value="{DynamicResource TabItemHeaderMargin}" />
-        <Setter Property="Margin" Value="0" />
-        <Setter Property="MinHeight" Value="{DynamicResource TabStripItemMinHeight}" />
-        <Setter Property="VerticalContentAlignment" Value="Center" />
-        <Setter Property="Template">
-            <ControlTemplate>
-                <Border
-                    Name="PART_LayoutRoot"
-                    Padding="{TemplateBinding Padding}"
-                    BorderBrush="{TemplateBinding BorderBrush}"
-                    BorderThickness="{TemplateBinding BorderThickness}"
-                    CornerRadius="{TemplateBinding CornerRadius}">
-                    <Panel>
-                        <ContentPresenter
-                            Name="PART_ContentPresenter"
-                            HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"
-                            VerticalAlignment="{TemplateBinding VerticalContentAlignment}"
-                            Content="{TemplateBinding Content}"
-                            ContentTemplate="{TemplateBinding ContentTemplate}"
-                            FontFamily="{TemplateBinding FontFamily}"
-                            FontSize="{TemplateBinding FontSize}"
-                            FontWeight="{TemplateBinding FontWeight}" />
-                        <Border Name="PART_SelectedPipe" Background="{DynamicResource TabItemHeaderSelectedPipeFill}" />
-                    </Panel>
-                </Border>
-            </ControlTemplate>
-        </Setter>
+  <x:Double x:Key="TabStripItemMinHeight">48</x:Double>
+  <x:Double x:Key="TabStripItemPipeThickness">2</x:Double>
 
-        <Style Selector="^ /template/ Border#PART_SelectedPipe">
-            <Setter Property="CornerRadius" Value="{DynamicResource ControlCornerRadius}" />
-        </Style>
+  <ControlTheme x:Key="{x:Type TabStripItem}" TargetType="TabStripItem">
+    <Setter Property="FontSize" Value="{DynamicResource TabItemHeaderFontSize}" />
+    <Setter Property="FontWeight" Value="{DynamicResource TabItemHeaderThemeFontWeight}" />
+    <Setter Property="Background" Value="{DynamicResource TabItemHeaderBackgroundUnselected}" />
+    <Setter Property="Foreground" Value="{DynamicResource TabItemHeaderForegroundUnselected}" />
+    <Setter Property="Padding" Value="{DynamicResource TabItemHeaderMargin}" />
+    <Setter Property="Margin" Value="0" />
+    <Setter Property="MinHeight" Value="{DynamicResource TabStripItemMinHeight}" />
+    <Setter Property="VerticalContentAlignment" Value="Center" />
+    <Setter Property="Template">
+      <ControlTemplate>
+        <Border
+            Name="PART_LayoutRoot"
+            Background="{TemplateBinding Background}"
+            BorderBrush="{TemplateBinding BorderBrush}"
+            BorderThickness="{TemplateBinding BorderThickness}"
+            CornerRadius="{TemplateBinding CornerRadius}"
+            Padding="{TemplateBinding Padding}">
+          <Panel>
+            <ContentPresenter
+                Name="PART_ContentPresenter"
+                HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"
+                VerticalAlignment="{TemplateBinding VerticalContentAlignment}"
+                Content="{TemplateBinding Content}"
+                ContentTemplate="{TemplateBinding ContentTemplate}"
+                FontFamily="{TemplateBinding FontFamily}"
+                FontSize="{TemplateBinding FontSize}"
+                FontWeight="{TemplateBinding FontWeight}" />
+            <Border Name="PART_SelectedPipe"
+                    Background="{DynamicResource TabItemHeaderSelectedPipeFill}"
+                    CornerRadius="{DynamicResource ControlCornerRadius}"
+                    Height="{DynamicResource TabStripItemPipeThickness}"
+                    IsVisible="False"
+                    Margin="0,0,0,2"
+                    VerticalAlignment="Bottom"/>
+          </Panel>
+        </Border>
+      </ControlTemplate>
+    </Setter>
 
-        <!--  Nornal state  -->
-        <Style Selector="^ /template/ Border#PART_LayoutRoot">
-            <Setter Property="Background" Value="{Binding $parent[TabStripItem].Background}" />
-        </Style>
-        <Style Selector="^ /template/ Border#PART_SelectedPipe">
-            <Setter Property="IsVisible" Value="False" />
-        </Style>
-        <Style Selector="^ /template/ Border#PART_SelectedPipe">
-            <Setter Property="Height" Value="{DynamicResource TabStripItemPipeThickness}" />
-            <Setter Property="Margin" Value="0,0,0,2" />
-            <Setter Property="HorizontalAlignment" Value="Stretch" />
-            <Setter Property="VerticalAlignment" Value="Bottom" />
-        </Style>
+    <!--  Selected state  -->
+    <!--  We don't use selector to PART_LayoutRoot, so developer can override selected item background with TabStripItem.Background  -->
+    <Style Selector="^:selected">
+      <Setter Property="Background" Value="{DynamicResource TabItemHeaderBackgroundSelected}" />
+      <Setter Property="Foreground" Value="{DynamicResource TabItemHeaderForegroundSelected}" />
+    </Style>
+    <Style Selector="^:selected /template/ Border#PART_SelectedPipe">
+      <Setter Property="IsVisible" Value="True" />
+    </Style>
 
-        <!--  Selected state  -->
-        <!--  We don't use selector to PART_LayoutRoot, so developer can override selected item background with TabStripItem.Background  -->
-        <Style Selector="^:selected">
-            <Setter Property="Background" Value="{DynamicResource TabItemHeaderBackgroundSelected}" />
-            <Setter Property="Foreground" Value="{DynamicResource TabItemHeaderForegroundSelected}" />
-        </Style>
-        <Style Selector="^:selected /template/ Border#PART_SelectedPipe">
-            <Setter Property="IsVisible" Value="True" />
-        </Style>
+    <!--  PointerOver state  -->
+    <Style Selector="^:pointerover /template/ Border#PART_LayoutRoot">
+      <Setter Property="Background" Value="{DynamicResource TabItemHeaderBackgroundUnselectedPointerOver}" />
+      <Setter Property="TextElement.Foreground" Value="{DynamicResource TabItemHeaderForegroundUnselectedPointerOver}" />
+    </Style>
 
-        <!--  PointerOver state  -->
-        <Style Selector="^:pointerover /template/ Border#PART_LayoutRoot">
-            <Setter Property="Background" Value="{DynamicResource TabItemHeaderBackgroundUnselectedPointerOver}" />
-            <Setter Property="TextElement.Foreground" Value="{DynamicResource TabItemHeaderForegroundUnselectedPointerOver}" />
-        </Style>
+    <!--  Selected PointerOver state  -->
+    <Style Selector="^:selected:pointerover /template/ Border#PART_LayoutRoot">
+      <Setter Property="Background" Value="{DynamicResource TabItemHeaderBackgroundSelectedPointerOver}" />
+      <Setter Property="TextElement.Foreground" Value="{DynamicResource TabItemHeaderForegroundSelectedPointerOver}" />
+    </Style>
 
-        <!--  Selected PointerOver state  -->
-        <Style Selector="^:selected:pointerover /template/ Border#PART_LayoutRoot">
-            <Setter Property="Background" Value="{DynamicResource TabItemHeaderBackgroundSelectedPointerOver}" />
-            <Setter Property="TextElement.Foreground" Value="{DynamicResource TabItemHeaderForegroundSelectedPointerOver}" />
-        </Style>
+    <!--  Pressed state  -->
+    <Style Selector="^:pressed /template/ Border#PART_LayoutRoot">
+      <Setter Property="Background" Value="{DynamicResource TabItemHeaderBackgroundUnselectedPressed}" />
+      <Setter Property="TextElement.Foreground" Value="{DynamicResource TabItemHeaderForegroundUnselectedPressed}" />
+    </Style>
 
-        <!--  Pressed state  -->
-        <Style Selector="^:pressed /template/ Border#PART_LayoutRoot">
-            <Setter Property="Background" Value="{DynamicResource TabItemHeaderBackgroundUnselectedPressed}" />
-            <Setter Property="TextElement.Foreground" Value="{DynamicResource TabItemHeaderForegroundUnselectedPressed}" />
-        </Style>
+    <!--  Selected Pressed state  -->
+    <Style Selector="^:selected:pressed /template/ Border#PART_LayoutRoot">
+      <Setter Property="Background" Value="{DynamicResource TabItemHeaderBackgroundSelectedPressed}" />
+      <Setter Property="TextElement.Foreground" Value="{DynamicResource TabItemHeaderForegroundSelectedPressed}" />
+    </Style>
 
-        <!--  Selected Pressed state  -->
-        <Style Selector="^:selected:pressed /template/ Border#PART_LayoutRoot">
-            <Setter Property="Background" Value="{DynamicResource TabItemHeaderBackgroundSelectedPressed}" />
-            <Setter Property="TextElement.Foreground" Value="{DynamicResource TabItemHeaderForegroundSelectedPressed}" />
-        </Style>
-
-        <!--  Disabled state  -->
-        <Style Selector="^:disabled /template/ Border#PART_LayoutRoot">
-            <Setter Property="Background" Value="{DynamicResource TabItemHeaderBackgroundDisabled}" />
-            <Setter Property="TextElement.Foreground" Value="{DynamicResource TabItemHeaderForegroundDisabled}" />
-        </Style>
-    </ControlTheme>
+    <!--  Disabled state  -->
+    <Style Selector="^:disabled /template/ Border#PART_LayoutRoot">
+      <Setter Property="Background" Value="{DynamicResource TabItemHeaderBackgroundDisabled}" />
+      <Setter Property="TextElement.Foreground" Value="{DynamicResource TabItemHeaderForegroundDisabled}" />
+    </Style>
+  </ControlTheme>
 </ResourceDictionary>