Editopia/Editopia.Editor/App.xaml

<Application xmlns="https://github.com/avaloniaui"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
  <Application.Styles>

    <Style Selector="Border.grouped">
      <Setter Property="Background" Value="{DynamicResource ThemeBackgroundBrush}"/>
      <Setter Property="BorderBrush" Value="{DynamicResource ThemeBorderLightBrush}"/>
      <Setter Property="CornerRadius" Value="2"/>
      <Setter Property="BorderThickness" Value="3"/>
    </Style>
    
    <Style Selector="Button">
      <Setter Property="FontWeight" Value="Light"/>
      <Setter Property="FontFamily" Value="resm:Editopia.Editor.Assets.Font.Roboto-Light.ttf?assembly=Editopia.Editor#Roboto" />
      <Setter Property="FontSize" Value="14"/>
    </Style>

    <Style Selector="TextBlock.content">
      <Setter Property="Foreground" Value="#212121"/>
      <Setter Property="FontSize" Value="20"/>
      <Setter Property="FontWeight" Value="Regular"/>
      <Setter Property="FontFamily" Value="resm:Editopia.Editor.Assets.Font.Roboto-Regular.ttf?assembly=Editopia.Editor#Roboto"/>
    </Style>

    <Style Selector="TextBlock.emph">
      <Setter Property="FontWeight" Value="Bold"/>
      <Setter Property="FontFamily" Value="resm:Editopia.Editor.Assets.Font.Roboto-Bold.ttf?assembly=Editopia.Editor#Roboto"/>
    </Style>

    <Style Selector="TextBlock.h1">
      <Setter Property="Foreground" Value="#212121"/>
      <Setter Property="FontSize" Value="56"/>
      <Setter Property="FontWeight" Value="Light"/>
      <Setter Property="FontFamily" Value="resm:Editopia.Editor.Assets.Font.Roboto-Light.ttf?assembly=Editopia.Editor#Roboto"/>
    </Style>

    <Style Selector="TextBlock.sub1">
      <Setter Property="FontWeight" Value="Regular"/>
      <Setter Property="FontFamily" Value="resm:Editopia.Editor.Assets.Font.Roboto-Regular.ttf?assembly=Editopia.Editor#Roboto"/>
      <Setter Property="Foreground" Value="#727272"/>
      <Setter Property="FontSize" Value="13"/>
    </Style>

    <Style Selector="TextBlock.h2">
      <Setter Property="Foreground" Value="#212121"/>
      <Setter Property="FontSize" Value="42"/>
      <Setter Property="FontWeight" Value="Light"/>
      <Setter Property="FontFamily" Value="resm:Editopia.Editor.Assets.Font.Roboto-Light.ttf?assembly=Editopia.Editor#Roboto"/>
    </Style>
    
    <Style Selector="TextBlock.brand">
      <Setter Property="FontWeight" Value="Regular"/>
      <Setter Property="FontFamily" Value="resm:Editopia.Editor.Assets.Font.Awesome.Fa5-Brands-Regular-400.otf?assembly=Editopia.Editor#FontAwesome"/>
    </Style>

    <StyleInclude Source="resm:Avalonia.Themes.Default.DefaultTheme.xaml?assembly=Avalonia.Themes.Default"/>
    <StyleInclude Source="resm:Avalonia.Themes.Default.Accents.BaseLight.xaml?assembly=Avalonia.Themes.Default"/>
    <StyleInclude Source="resm:Editopia.Editor.Sidebar.Sidebar.xaml"/>
  </Application.Styles>
</Application>