XS202307318652/Themes/Generic.xaml

<ResourceDictionary
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="clr-namespace:NS_Marquee;assembly=Marquee">

    <Style TargetType="{x:Type local:Marquee}">
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type local:Marquee}">
                    <Border Background="{TemplateBinding Background}"
                            BorderBrush="{TemplateBinding BorderBrush}"
                            BorderThickness="{TemplateBinding BorderThickness}">
                        <ContentPresenter x:Name="PART_ContentHost" Margin="{TemplateBinding Padding}"
                                          HorizontalAlignment="Left"
                                          ContentSource="Content" ContentTemplate="{TemplateBinding ContentTemplate}"
                                          ContentStringFormat="{TemplateBinding ContentStringFormat}"
                                          ContentTemplateSelector="{TemplateBinding ContentTemplateSelector}">
                        </ContentPresenter>
                    </Border>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>
</ResourceDictionary>