<Window.Resources>

    <Style x:Key="UserButtonStyle" TargetType="Button">

        <Setter Property="OverridesDefaultStyle" Value="True" />

        <Setter Property="Cursor" Value="Hand" />

        <Setter Property="Padding" Value="5 3" />

        <Setter Property="Background" Value="LightBlue" />

        <Setter Property="Template">

            <Setter.Value>

                <ControlTemplate TargetType="Button">

                    <Border Name="border" BorderThickness="0" BorderBrush="Black" Padding="{TemplateBinding Padding}" Background="{TemplateBinding Background}">

                        <ContentPresenter HorizontalAlignment="Center" VerticalAlignment="Center" />

                    </Border>

                    <ControlTemplate.Triggers>

                        <Trigger Property="IsMouseOver" Value="True">

                            <Setter Property="Opacity" Value="0.8" />

                        </Trigger>

                    </ControlTemplate.Triggers>

                </ControlTemplate>

            </Setter.Value>

        </Setter>

    </Style>

</Window.Resources>