NotificationFlyout/NotificationFlyout.Uwp.UI.Controls/NotificationFlyoutPresenter/NotificationFlyoutPresenter.xaml

<ResourceDictionary
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:controls="using:NotificationFlyout.Uwp.UI.Controls">
    <Style TargetType="controls:NotificationFlyoutPresenter">
        <Setter Property="Background" Value="{StaticResource SystemControlTransientBackgroundBrush}" />
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="controls:NotificationFlyoutPresenter">
                    <Border
                        x:Name="Root"
                        Padding="{TemplateBinding Padding}"
                        Background="{TemplateBinding Background}"
                        BackgroundSizing="OuterBorderEdge"
                        BorderBrush="{TemplateBinding BorderBrush}"
                        BorderThickness="{TemplateBinding BorderThickness}"
                        CornerRadius="{TemplateBinding CornerRadius}">
                        <ScrollViewer
                            x:Name="ScrollViewer"
                            AutomationProperties.AccessibilityView="Raw"
                            HorizontalScrollBarVisibility="{TemplateBinding ScrollViewer.HorizontalScrollBarVisibility}"
                            HorizontalScrollMode="{TemplateBinding ScrollViewer.HorizontalScrollMode}"
                            VerticalScrollBarVisibility="{TemplateBinding ScrollViewer.VerticalScrollBarVisibility}"
                            VerticalScrollMode="{TemplateBinding ScrollViewer.VerticalScrollMode}"
                            ZoomMode="{TemplateBinding ScrollViewer.ZoomMode}">
                            <ContentPresenter
                                Margin="{TemplateBinding Padding}"
                                HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"
                                VerticalAlignment="{TemplateBinding VerticalContentAlignment}"
                                Content="{TemplateBinding Content}"
                                ContentTemplate="{TemplateBinding ContentTemplate}"
                                ContentTransitions="{TemplateBinding ContentTransitions}" />
                        </ScrollViewer>
                    </Border>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>
</ResourceDictionary>