MvvMAva/AvaloniaApplication4/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>

  <!-- Add Styles Here -->
	<Style Selector="TextBlock">
		<Setter Property="Foreground" Value="#2F4F4F" />

	</Style>
	<Style Selector="TextBox">
		<Setter Property="Background" Value="#ADD8E6" />
		<Setter Property="Foreground" Value="#000000" />
	</Style>
	<Style Selector="Button">
		<Setter Property="Background" Value="#87CEEB" />
		<Setter Property="Foreground" Value="#000000" />

		<Setter Property="Padding" Value="10" />

		<Setter Property="BorderThickness" Value="2" />
		<Setter Property="BorderBrush" Value="#C7C5B8" />

		<Setter Property="FontSize" Value="16" />

		<Setter Property="Cursor" Value="Hand" />
		<Setter Property="CornerRadius" Value="10" />
		<Setter Property="Margin" Value="5" />

	</Style>
</Styles>