rainmeter-studio/RainmeterStudio/UI/Styles/ButtonStyle.xaml

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
    <Style TargetType="Button">
        <Setter Property="Margin" Value="1" />
        <Setter Property="Padding" Value="6,1,6,1" />
        <Setter Property="SnapsToDevicePixels" Value="True" />
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="Button">
                    <Border Name="_border"
                            BorderBrush="Gray"
                            BorderThickness="1"
                            CornerRadius="2"
                            Padding="{TemplateBinding Padding}">
                        <Border.Background>
                            <LinearGradientBrush StartPoint="0,0" EndPoint="0,1">
                                <GradientStop Color="#eeee" Offset="0" />
                                <GradientStop Color="#cccc" Offset="1" />
                            </LinearGradientBrush>
                        </Border.Background>
                        <ContentPresenter Name="_content" />
                    </Border>
                    <ControlTemplate.Triggers>
                        <Trigger Property="IsMouseOver" Value="True">
                            <Setter TargetName="_border" Property="Background" >
                                <Setter.Value>
                                    <LinearGradientBrush StartPoint="0,0" EndPoint="0,1">
                                        <GradientStop Color="#eeee" Offset="0" />
                                        <GradientStop Color="#dddd" Offset="1" />
                                    </LinearGradientBrush>
                                </Setter.Value>
                            </Setter>
                        </Trigger>

                        <Trigger Property="IsPressed" Value="True">
                            <Setter TargetName="_border" Property="Background" >
                                <Setter.Value>
                                    <LinearGradientBrush StartPoint="0,0" EndPoint="0,1">
                                        <GradientStop Color="#dddd" Offset="0" />
                                        <GradientStop Color="#bbbb" Offset="1" />
                                    </LinearGradientBrush>
                                </Setter.Value>
                            </Setter>
                        </Trigger>

                        <Trigger Property="IsEnabled" Value="False">
                            <Setter TargetName="_content" Property="Opacity" Value=".5" />
                        </Trigger>
                        
                    </ControlTemplate.Triggers>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>
</ResourceDictionary>