WPF Button ControlTemplate EventTrigger RoutedEvent BeginStoryboard Storyboard ColorAnimation Storyboard.TargetName Storyboard.TargetProperty To Duration

<Window x:Class="WpfApp156.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:WpfApp156"
        mc:Ignorable="d"
        Title="MainWindow" Height="450" Width="800">
    <Window.Resources>
        <ControlTemplate x:Key="btnTemplate"
                         TargetType="{x:Type Button}">
            <Border BorderBrush="Orange"
                    BorderThickness="5"
                    CornerRadius="10"
                    Background="Red"
                    TextBlock.Foreground="Black">
                <ContentPresenter/>
            </Border>
        </ControlTemplate>

        <ControlTemplate x:Key="btn2Template"
                         TargetType="{x:Type Button}">
            <Border x:Name="border"
                    BorderBrush="Orange"
                    BorderThickness="5"
                    CornerRadius="2"
                    Background="Red"
                    TextBlock.Foreground="Black">
                <Grid>
                    <Rectangle x:Name="focusCue"
                               Visibility="Hidden"
                               Stroke="Black"
                               StrokeThickness="5"
                               StrokeDashArray="1 2"
                               SnapsToDevicePixels="True">                        
                    </Rectangle>               
                <ContentPresenter RecognizesAccessKey="True"
                                  Margin="{TemplateBinding Padding}"></ContentPresenter>
                </Grid>
            </Border>
            <ControlTemplate.Triggers>
                <EventTrigger RoutedEvent="MouseEnter">
                    <BeginStoryboard>
                        <Storyboard>
                            <ColorAnimation Storyboard.TargetName="border"
                                            Storyboard.TargetProperty="Background.Color"
                                            To="Blue"
                                            Duration="0:0:2"
                                            AutoReverse="False"
                                            RepeatBehavior="Forever"
                                            />
                        </Storyboard>
                    </BeginStoryboard>
                </EventTrigger>
                <EventTrigger RoutedEvent="MouseLeave">
                    <BeginStoryboard>
                        <Storyboard>
                            <ColorAnimation Storyboard.TargetName="border"
                                            Storyboard.TargetProperty="Background.Color"
                                            To="White"
                                            Duration="0:0:2"/>
                        </Storyboard>
                    </BeginStoryboard>
                </EventTrigger>
            </ControlTemplate.Triggers>
        </ControlTemplate>
    </Window.Resources>
    <StackPanel Margin="5">
        <Button Template="{StaticResource btnTemplate}"
                Padding="5" Margin="5">First Button</Button>
        <Button Template="{StaticResource btn2Template}"
                Padding="5" Margin="5">Second Button</Button>
    </StackPanel>
</Window>