AvaloniaProject/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="Button">
		<Setter Property="Background" Value="#B44A45"></Setter>
		<Setter Property="Foreground" Value="White"></Setter>
		<Setter Property="FontFamily" Value="MontserratBold"></Setter>
		<Setter	Property="FontSize" Value="16"/>
		<Setter Property="Padding" Value="16 16 16 16"/>
		<Setter Property="HorizontalContentAlignment" Value="Center"/>
	</Style>
	<Style Selector="Button:pointerover/template/ContentPresenter#PART_ContentPresenter">
		<Setter Property="Background" Value="#E7332A"></Setter>
		<Setter Property="Foreground" Value="White"></Setter>
		<Setter Property="FontFamily" Value="MontserratBold"></Setter>
		<Setter	Property="FontSize" Value="16"/>
		<Setter Property="Padding" Value="16 16 16 16"/>
		<Setter Property="HorizontalContentAlignment" Value="Center"/>
	</Style>
	<Style Selector="Button.menuElement">
		<Setter Property="Background" Value="Transparent"></Setter>
		<Setter Property="Foreground" Value="White"></Setter>
		<Setter	Property="FontSize" Value="20"/>
		<Setter Property="HorizontalContentAlignment" Value="Left"/>
		<Setter Property="Padding" Value="0"/>
	</Style>
	<Style Selector="Button.menuElement:pointerover/template/ContentPresenter#PART_ContentPresenter">
		<Setter Property="Background" Value="Transparent"></Setter>
		<Setter Property="Foreground" Value="White"></Setter>
		<Setter	Property="FontSize" Value="20"/>
		<Setter Property="HorizontalContentAlignment" Value="Left"/>
		<Setter Property="Padding" Value="0"/>
	</Style>
	<Style Selector="Window">
		<Setter	Property="FontSize" Value="24"/>
		<Setter	Property="Foreground" Value="Black"/>
		<Setter	Property="Background" Value="White"/>
	</Style>
	<Style Selector="TextBlock.titleStyle">
		<Setter	Property="FontSize" Value="32"/>
		<Setter	Property="Foreground" Value="Black"/>
		<Setter Property="TextWrapping" Value="Wrap"/>
	</Style>
	<Style Selector="TextBlock.litleText">
		<Setter	Property="FontSize" Value="16"/>
		<Setter Property="TextWrapping" Value="Wrap"/>
	</Style>
	<Style Selector="TextBlock.mediumText">
		<Setter	Property="FontSize" Value="20"/>
		<Setter Property="TextWrapping" Value="Wrap"/>
	</Style>
	<Style Selector="TextBlock.titleStyleLight">
		<Setter	Property="FontSize" Value="32"/>
		<Setter	Property="Foreground" Value="White"/>
		<Setter Property="TextWrapping" Value="Wrap"/>
	</Style>
	<Style Selector="TextBlock.litleTextLight">
		<Setter	Property="FontSize" Value="16"/>
		<Setter Property="Foreground" Value="White"/>
		<Setter Property="TextWrapping" Value="Wrap"/>
	</Style>
	<Style Selector="TextBlock.mediumTextLight">
		<Setter	Property="FontSize" Value="20"/>
		<Setter Property="Foreground" Value="White"/>
		<Setter Property="TextWrapping" Value="Wrap"/>
	</Style>
	<Style Selector="TextBox">
		<Setter	Property="FontSize" Value="16"/>
		<Setter Property="Background" Value="#ECF2F7"/>
		<Setter Property="BorderBrush" Value="Transparent"/>
		<Setter Property="CornerRadius" Value="10"/>
		<Setter Property="Padding" Value="16 16 16 16"/>
		<Setter Property="Foreground" Value="Black"/>
	</Style>
	<Style Selector="TextBox:focus/template/Border">
		<Setter Property="Background" Value="#ECF2F7"/>
		<Setter Property="BorderBrush" Value="Transparent"/>
		<Setter Property="CornerRadius" Value="10"/>
	</Style>
	<Style Selector="TextBox:pointerover/template/Border">
		<Setter Property="Background" Value="#ECF2F7"/>
		<Setter Property="BorderBrush" Value="Transparent"/>
		<Setter Property="CornerRadius" Value="10"/>
	</Style>
	<Style Selector="StackPanel.backgroundStackPanel">
		<Setter Property="Background" Value="#B44A45"/>
	</Style>
	<Style Selector="ListBox">
		<Setter Property="Background" Value="Transparent"/>
		<Setter Property="BorderBrush" Value="Transparent"/>
	</Style>
	<Style Selector="ListBox:pointerover/template/ContentPresenter">
		<Setter Property="Background" Value="Transparent"/>
		<Setter Property="BorderBrush" Value="Transparent"/>
	</Style>
	<Style Selector="ListBox:focus/template/ContentPresenter">
		<Setter Property="Background" Value="Transparent"/>
		<Setter Property="BorderBrush" Value="Transparent"/>
	</Style>
	<Style Selector="ListBox:pressed/template/ContentPresenter">
		<Setter Property="Background" Value="Transparent"/>
		<Setter Property="BorderBrush" Value="Transparent"/>
	</Style>
</Styles>