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

<Styles xmlns="https://github.com/avaloniaui"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
	<Style Selector="TabControl">
		<Setter Property="ItemsPanel">
			<Setter.Value>
				<ItemsPanelTemplate>
					<UniformGrid Rows="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">
							<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 Border#PART_HeaderBorder">
		<Setter Property="Background" Value="{DynamicResource PrsMenuBackground}"/>
		<Setter Property="BorderBrush" Value="{DynamicResource PrsMenuBackground}"/>
		<Setter Property="BorderThickness" Value="2"/>
		<Setter Property="CornerRadius" Value="{DynamicResource PrsCornerRadius}"/>
	</Style>
	<Style Selector="TabItem">
		<Setter Property="Height" Value="30"/>
		<Setter Property="MinHeight" Value="0"/>
		<Setter Property="FontSize" Value="{DynamicResource PrsFontSizeSmall}"/>
		
		<Setter Property="HorizontalContentAlignment" Value="Center"/>
		
		<Setter Property="Background" Value="{DynamicResource PrsMenuBackground}"/>
		<Setter Property="Foreground" Value="White"/>
		<Setter Property="CornerRadius" Value="{DynamicResource PrsCornerRadius}"/>
	</Style>
	
	<Style Selector="TabItem:pointerover /template/ Border#PART_LayoutRoot">
		<Setter Property="Background" Value="{DynamicResource PrsMenuBackground}"/>
		<Setter Property="TextElement.Foreground" Value="White"/>
	</Style>
	
	<Style Selector="TabItem:selected">
		<Setter Property="Background" Value="{DynamicResource PrsTileBackground}"/>
	</Style>
	<Style Selector="TabItem:selected:pointerover /template/ Border#PART_LayoutRoot">
		<Setter Property="Background" Value="{DynamicResource PrsTileBackground}"/>
		<Setter Property="TextElement.Foreground" Value="Black"/>
	</Style>
	
	<Style Selector="TabItem:selected /template/ Border#PART_SelectedPipe">
		<Setter Property="IsVisible" Value="False"/>
	</Style>
</Styles>