AvaloniaPR4/Calendar/Styles.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="StackPanel">
		<Setter Property="Margin" Value="10"/>
	</Style>
	<Style Selector="DatePicker">
		<Setter Property="BorderBrush" Value="#FF0000"/>
		<Setter Property="Height" Value="33"/>
		<Setter Property="Width" Value="380"/>
		<Setter Property="FontSize" Value="17"/>
	</Style>
	<Style Selector="TextBlock">
		<Setter Property="Margin" Value="0 0 5 0"/>
		<Setter Property="FontSize" Value="16"/>
	</Style>
	<Style Selector="TextBlock.title">
		<Setter Property="FontSize" Value="22"/>
		<Setter Property="Foreground" Value="Black"/>
	</Style>
	<Style Selector="TextBlock.subtitle">
		<Setter Property="Margin" Value="30 0 5 0"/>
	</Style>
	<Style Selector="TextBlock.const">
		<Setter Property="FontSize" Value="18"/>
		<Setter Property="Foreground" Value="#FF0000"/>
	</Style>
	<Style Selector="Button">
		<Setter Property="FontSize" Value="15"/>
		<Setter Property="Background" Value="#ea0909"/>
		<Setter Property="Foreground" Value="#FFFFFF"/>
	</Style>
	<Style Selector="StackPanel.horoscopeSP">
		<Setter Property="Orientation" Value="Horizontal"/>
		<Setter Property="HorizontalAlignment" Value="Center"/>
	</Style>
	<Style Selector="Button.horoscopeB">
		<Setter Property="Width" Value="260"/>
		<Setter Property="Margin" Value="0 0 10 0"/>
	</Style>
	<Style Selector="TextBlock.horoscopeTB">
		<Setter Property="HorizontalAlignment" Value="Center"/>
		<Setter Property="FontSize" Value="15"/>
	</Style>
	<Style Selector="TextBlock.errorTB">
		<Setter Property="FontSize" Value="18"/>
	</Style>
</Styles>