MatDesignSliderToggleButton

        <Style TargetType="{x:Type ToggleButton}">
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="{x:Type ToggleButton}">
                        <Viewbox>
                            <Border x:Name="Border" CornerRadius="10"
                                    Background="#FFE2E2E2"
                                    Width="40" Height="20">
                                <Border.Effect>
                                    <DropShadowEffect ShadowDepth="0.5" Direction="0" Opacity="0.3" />
                                </Border.Effect>
                                <Ellipse x:Name="Ellipse" Fill="#FF909090" Stretch="Uniform"
                                         Margin="-8 -4"
                                         Stroke="Gray" StrokeThickness="0.2"
                                         HorizontalAlignment="Stretch">
                                    <Ellipse.Effect>
                                        <DropShadowEffect BlurRadius="10" ShadowDepth="1" 
                                                          Opacity="0.3" Direction="260" />
                                    </Ellipse.Effect>
                                </Ellipse>
                            </Border>
                        </Viewbox>
                        <ControlTemplate.Triggers>
                            <EventTrigger RoutedEvent="Checked">
                                <BeginStoryboard>
                                    <Storyboard>
                                        <ColorAnimation Storyboard.TargetName="Ellipse"
                                                            Storyboard.TargetProperty="(Ellipse.Fill).(SolidColorBrush.Color)"
                                                            To="#FF0069F3"
                                                            Duration="0:0:0.05"
                                                        AccelerationRatio="0.7"
                                                        DecelerationRatio="0.3"/>
                                        <ThicknessAnimation Storyboard.TargetName="Ellipse"
                                                                Storyboard.TargetProperty="Margin"
                                                                To="20 -4 -8 -4"
                                                                Duration="0:0:0.15" 
                                                            AccelerationRatio="0.7"
                                                            DecelerationRatio="0.3"/>
                                    </Storyboard>
                                </BeginStoryboard>
                            </EventTrigger>
                            <EventTrigger RoutedEvent="Unchecked">
                                <BeginStoryboard>
                                    <Storyboard>
                                        <ColorAnimation Storyboard.TargetName="Ellipse"
                                                            Storyboard.TargetProperty="(Ellipse.Fill).(SolidColorBrush.Color)"
                                                            To="#FF909090"
                                                            Duration="0:0:0.05" 
                                                        AccelerationRatio="0.7"
                                                        DecelerationRatio="0.3"/>
                                        <ThicknessAnimation Storyboard.TargetName="Ellipse"
                                                                Storyboard.TargetProperty="Margin"
                                                                To="-8 -4"
                                                                Duration="0:0:0.15"
                                                            AccelerationRatio="0.7"
                                                        DecelerationRatio="0.3"/>
                                    </Storyboard>
                                </BeginStoryboard>
                            </EventTrigger>
                        </ControlTemplate.Triggers>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>