inabox/InABox.Avalonia/Theme/Classes/TabItem.axaml

<Styles xmlns="https://github.com/avaloniaui"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:classes="clr-namespace:InABox.Avalonia.Theme.Classes">
	
	<Style Selector="TabControl.Standard">
		<Style.Resources>
			<classes:TabItemHeaderMarginConverter x:Key="TabItemHeaderMarginConverter" Padding="2"/>
		</Style.Resources>
		<Setter Property="Padding" Value="0"/>
		<Setter Property="ItemsPanel">
			<Setter.Value>
				<ItemsPanelTemplate>
					<UniformGrid Rows="1" Margin="1"/>
				</ItemsPanelTemplate>
			</Setter.Value>
		</Setter>
        <Setter Property="Template">
			<ControlTemplate>
				<Border BorderBrush="{TemplateBinding BorderBrush}"
						BorderThickness="{TemplateBinding BorderThickness}"
						CornerRadius="{TemplateBinding CornerRadius}"
						Background="{TemplateBinding Background}"
						HorizontalAlignment="{TemplateBinding HorizontalAlignment}"
						VerticalAlignment="{TemplateBinding VerticalAlignment}">
					<DockPanel>
						<Border DockPanel.Dock="{TemplateBinding TabStripPlacement}"
								Name="PART_HeaderBorder"
								Margin="{TemplateBinding TabStripPlacement, Converter={StaticResource TabItemHeaderMarginConverter}}">
							<ItemsPresenter Name="PART_ItemsPresenter"
											ItemsPanel="{TemplateBinding ItemsPanel}"/>
						</Border>
						<ContentPresenter Name="PART_SelectedContentHost"
										  Margin="{TemplateBinding Padding}"
										  HorizontalContentAlignment="{TemplateBinding HorizontalContentAlignment}"
										  VerticalContentAlignment="{TemplateBinding VerticalContentAlignment}"
										  Content="{TemplateBinding SelectedContent}"
										  ContentTemplate="{TemplateBinding SelectedContentTemplate}" />
					</DockPanel>
				</Border>
			</ControlTemplate>
        </Setter>
	</Style>
	
	<Style Selector="TabControl.Standard Border#PART_HeaderBorder">
		<Setter Property="Background" Value="{DynamicResource PrsMenuBackground}"/>
		<Setter Property="BorderBrush" Value="{DynamicResource PrsMenuBackground}"/>
		<Setter Property="BorderThickness" Value="1"/>
		<Setter Property="CornerRadius" Value="{DynamicResource PrsCornerRadius}"/>
	</Style>
	
	<Style Selector="TabControl.Standard TabItem">
		<!-- <Setter Property="Height" Value="0"/> -->
		<Setter Property="MinHeight" Value="30"/>
		<Setter Property="FontSize" Value="{DynamicResource PrsFontSizeSmall}"/>
		<Setter Property="FontWeight" Value="{DynamicResource PrsFontWeightBold}" />
		<Setter Property="HorizontalContentAlignment" Value="Center"/>
		<Setter Property="Background" Value="{DynamicResource PrsMenuBackground}"/>
		<Setter Property="Foreground" Value="White"/>
		<Setter Property="CornerRadius" Value="{DynamicResource PrsCornerRadius}" />
		<Setter Property="Padding" Value="0,10,0,10"/>
		
	</Style>
	
	<Style Selector="TabControl.Standard TabItem:pointerover /template/ Border#PART_LayoutRoot">
		<Setter Property="Background" Value="{DynamicResource PrsMenuBackground}"/>
		<Setter Property="TextElement.Foreground" Value="White"/>
	</Style>
	
	<Style Selector="TabControl.Standard TabItem:selected">
		<Setter Property="Background" Value="{DynamicResource PrsTileBackground}"/>
		<Setter Property="TextElement.Foreground" Value="Black"/>
	</Style>
	
	<Style Selector="TabControl.Standard TabItem:selected:pointerover /template/ Border#PART_LayoutRoot">
		<Setter Property="Background" Value="{DynamicResource PrsTileBackground}"/>
		<Setter Property="TextElement.Foreground" Value="Black"/>
	</Style>
	
	<Style Selector="TabControl.Standard TabItem:selected /template/ Border#PART_SelectedPipe">
		<Setter Property="IsVisible" Value="False"/>
	</Style>
	
</Styles>