Shaker/Avalonia/SukiUI/Theme/TextBlock.xaml

<ResourceDictionary xmlns="https://github.com/avaloniaui" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
    <ControlTheme x:Key="SukiTextBlockStyle" TargetType="TextBlock">
        <Setter Property="FontSize" Value="14" />

        <Style Selector="^.h4">
            <Setter Property="Margin" Value="0 7 0 10" />
            <Setter Property="FontSize" Value="20" />
        </Style>
        <Style Selector="^.h3">

            <Setter Property="Margin" Value="0 10 0 15" />
            <Setter Property="FontWeight" Value="SemiBold" />
            <Setter Property="FontSize" Value="25" />
        </Style>
        <Style Selector="^.h2">
            <Setter Property="Margin" Value="0 12 0 20" />
            <Setter Property="FontWeight" Value="SemiBold" />
            <Setter Property="FontSize" Value="30" />
        </Style>
        <Style Selector="^.h1">
            <Setter Property="Margin" Value="0 20 0 30" />
            <Setter Property="FontWeight" Value="SemiBold" />
            <Setter Property="FontSize" Value="40" />
        </Style>
        <Style Selector="^.Caption">
            <Setter Property="Foreground" Value="{DynamicResource ThemeControlHighBrush}" />
        </Style>
        <Style Selector="^.Primary">
            <Setter Property="Foreground" Value="{DynamicResource SukiPrimaryColor}" />
        </Style>
        <Style Selector="^.Accent">
            <Setter Property="Foreground" Value="{DynamicResource SukiAccentColor}" />
        </Style>
    </ControlTheme>
    <ControlTheme x:Key="{x:Type TextBlock}"
                  BasedOn="{StaticResource SukiTextBlockStyle}"
                  TargetType="TextBlock" />
</ResourceDictionary>