wpf的button设置鼠标经过时的背景色 IsMouseOver

<Style TargetType="{x:Type Button}">
    <Setter Property="Foreground" Value="White" />
    <Setter Property="Background" Value="Orange"/>
    <Setter Property="BorderThickness" Value="1" />
    <Setter Property="BorderBrush" Value="White" />
    <Setter Property="Margin" Value="5" />
    <Setter Property="Cursor" Value="Hand" />
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="{x:Type Button}">
                <Border Background="{TemplateBinding Background}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}">
                    <ContentPresenter HorizontalAlignment="Center" VerticalAlignment="Center"/>
                </Border>
            </ControlTemplate>
        </Setter.Value>
    </Setter>
    <Style.Triggers>
        <Trigger Property="IsMouseOver" Value="True">
            <Setter Property="Background" Value="White"/>
            <Setter Property="BorderThickness" Value="1"/>
            <Setter Property="BorderBrush" Value="Orange"/>
            <Setter Property="Foreground" Value="Orange" />
        </Trigger>
        <Trigger Property="IsPressed" Value="True">
            <Setter Property="Background" Value="Orange"/>
            <Setter Property="BorderThickness" Value="1"/>
            <Setter Property="BorderBrush" Value="White" />
            <Setter Property="Foreground" Value="White" />
        </Trigger>
    </Style.Triggers>
</Style>