Add Drop Shadow Effect to button in wpf

<Style TargetType="Button">
            <Setter Property="Button.Effect">
                <Setter.Value>
                    <DropShadowEffect Color="Black" Direction="320" ShadowDepth="3" BlurRadius="5" Opacity="0.5" />
                </Setter.Value>
            </Setter>
        
  </Style>