Shaker/Avalonia/SukiUI/Theme/NotificationStyle.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="WindowNotificationManager">
        <Setter Property="Margin" Value="0 0" />
        <Setter Property="Background" Value="Red" />
        <Setter Property="Template">
            <ControlTemplate>
                <ReversibleStackPanel Name="PART_Items">
                    <ReversibleStackPanel.DataTemplates>
                        <DataTemplate DataType="INotification">
                            <StackPanel Margin="12"
                                        Background="{DynamicResource SukiBackground}"
                                        Spacing="8"
                                        TextBlock.Foreground="{DynamicResource SukiText}">
                                <TextBlock FontSize="18"
                                           FontWeight="{DynamicResource DefaultDemiBold}"
                                           Text="{Binding Title}" />
                                <TextBlock MaxHeight="80"
                                           Margin="0,0,12,0"
                                           Text="{Binding Message}"
                                           TextWrapping="Wrap" />
                            </StackPanel>
                        </DataTemplate>
                        <DataTemplate DataType="x:String">
                            <TextBlock Margin="12"
                                       Foreground="{DynamicResource SystemControlForegroundBaseHighBrush}"
                                       Text="{Binding}" />
                        </DataTemplate>
                    </ReversibleStackPanel.DataTemplates>
                </ReversibleStackPanel>
            </ControlTemplate>
        </Setter>
    </Style>

    <Style Selector="WindowNotificationManager:topleft /template/ ReversibleStackPanel#PART_Items">
        <Setter Property="VerticalAlignment" Value="Top" />
        <Setter Property="HorizontalAlignment" Value="Left" />
    </Style>

    <Style Selector="WindowNotificationManager:topright /template/ ReversibleStackPanel#PART_Items">
        <Setter Property="VerticalAlignment" Value="Top" />
        <Setter Property="HorizontalAlignment" Value="Right" />
    </Style>

    <Style Selector="WindowNotificationManager:bottomleft /template/ ReversibleStackPanel#PART_Items">
        <Setter Property="ReverseOrder" Value="True" />
        <Setter Property="VerticalAlignment" Value="Bottom" />
        <Setter Property="HorizontalAlignment" Value="Left" />
    </Style>

    <Style Selector="WindowNotificationManager:bottomright /template/ ReversibleStackPanel#PART_Items">
        <Setter Property="ReverseOrder" Value="True" />
        <Setter Property="VerticalAlignment" Value="Bottom" />
        <Setter Property="HorizontalAlignment" Value="Right" />
    </Style>

</Styles>