wpf中取消按钮的默认样式

<Style x:Key="TransparentButton" TargetType="Button">
    <Setter Property="Background" Value="Transparent"/>
    <Setter Property="BorderThickness" Value="0"/>
    <Setter Property="Cursor" Value="Hand"/>
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="Button">
                <Border Background="{TemplateBinding Background}">
                    <ContentPresenter HorizontalAlignment="Center" VerticalAlignment="Center"/>
                </Border>
            </ControlTemplate>
        </Setter.Value>
    </Setter>
    <Style.Triggers>
        <Trigger Property="IsMouseOver" Value="True">
            <Setter Property="Opacity" Value="0.8"/>
        </Trigger>
    </Style.Triggers>
</Style>

<Button  Style="{StaticResource TransparentButton}" Content="&#xe643;" 
           FontFamily="./Resource/fonts/#iconfont"
        />