avalonia_znak/AvaloniaApplication3/Styles1.axaml

<Styles xmlns="https://github.com/avaloniaui"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
  <Design.PreviewWith>
    <Border Padding="20">
      <!-- Add Controls for Previewer Here -->
    </Border>
  </Design.PreviewWith>

	<Style Selector="Button">
		<Setter Property="Background" Value="#F64C72"/>
		<Setter Property="Foreground" Value="#FFFF"/>
		<!--<Setter Property="FontSize" Value="20"/>-->
	</Style>

	<Style Selector="TextBlock">
		<Setter Property="Foreground" Value="#F64C72"/>
		<!--<Setter Property="Foreground" Value="#4C2F27"/>-->
		<Setter Property="FontSize" Value="20"/>
	</Style>
	
</Styles>