QuickLook/QuickLook.Plugin/QuickLook.Plugin.VideoViewer/Styles.xaml

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
    <ResourceDictionary.MergedDictionaries>
        <!-- only for design -->
        <ResourceDictionary Source="/QuickLook.Common;component/Styles/MainWindowStyles.xaml" />
    </ResourceDictionary.MergedDictionaries>

    <Style x:Key="ControlButtonStyle" TargetType="Button" BasedOn="{StaticResource CaptionButtonStyle}">
        <Setter Property="Width" Value="32" />
    </Style>

    <!-- Postion Slider Control -->
    <ControlTemplate x:Key="PositionSliderThumbTemplate" TargetType="{x:Type Thumb}">
        <Grid HorizontalAlignment="Center" UseLayoutRounding="True" VerticalAlignment="Center">
            <Path x:Name="grip" Data="M 0,0 A 180,180 180 1 1 1,1 Z" Fill="Transparent" Stretch="Fill"
                  Stroke="{DynamicResource WindowTextForeground}" StrokeThickness="1" UseLayoutRounding="True"
                  VerticalAlignment="Center"
                  Margin="-1,-1" />
        </Grid>
        <ControlTemplate.Triggers>
            <Trigger Property="IsDragging" Value="true">
                <Setter Property="Fill" TargetName="grip" Value="{DynamicResource WindowTextForeground}" />
                <Setter Property="Stroke" TargetName="grip" Value="{DynamicResource WindowTextForeground}" />
            </Trigger>
            <Trigger Property="IsEnabled" Value="false">
                <Setter Property="Visibility" TargetName="grip" Value="Hidden" />
            </Trigger>
            <Trigger Property="IsKeyboardFocused" Value="true">
                <Setter Property="Fill" TargetName="grip" Value="{DynamicResource WindowTextForeground}" />
            </Trigger>
        </ControlTemplate.Triggers>
    </ControlTemplate>
    <ControlTemplate x:Key="PositionSliderTemplate" TargetType="{x:Type Slider}">
        <Border x:Name="border" Background="Transparent" SnapsToDevicePixels="True">
            <Grid>
                <Grid.RowDefinitions>
                    <RowDefinition Height="{TemplateBinding MinHeight}" />
                </Grid.RowDefinitions>
                <DockPanel LastChildFill="True">
                    <Border ClipToBounds="True" x:Name="PART_SelectionRange" Height="1" Visibility="Visible">
                        <Rectangle RadiusX="1" RadiusY="1" Margin="10,0,-10,0"
                                   Fill="{DynamicResource WindowTextForeground}" />
                    </Border>
                    <Border ClipToBounds="True" Height="1" Visibility="Visible">
                        <Rectangle RadiusX="1" RadiusY="1" Margin="10,0,10,0"
                                   Fill="{DynamicResource WindowTextForegroundAlternative}" />
                    </Border>
                </DockPanel>
                <Track x:Name="PART_Track">
                    <Track.Thumb>
                        <Thumb x:Name="Thumb" Focusable="False" Width="{TemplateBinding MinHeight}"
                               Height="{TemplateBinding MinHeight}"
                               OverridesDefaultStyle="True" Template="{StaticResource PositionSliderThumbTemplate}"
                               VerticalAlignment="Center" />
                    </Track.Thumb>
                </Track>
            </Grid>
        </Border>
    </ControlTemplate>
    <Style x:Key="PositionSliderStyle" TargetType="{x:Type Slider}">
        <Setter Property="Stylus.IsPressAndHoldEnabled" Value="false" />
        <Setter Property="Background" Value="Transparent" />
        <Setter Property="BorderBrush" Value="Transparent" />
        <Setter Property="MinHeight" Value="10" />
        <Setter Property="MaxHeight" Value="10" />
        <Setter Property="Height" Value="10" />
        <Setter Property="Minimum" Value="0" />
        <Setter Property="Focusable" Value="False" />
        <Setter Property="AutoToolTipPlacement" Value="None" />
        <Setter Property="IsMoveToPointEnabled" Value="True" />
        <Setter Property="VerticalAlignment" Value="Center" />
        <Setter Property="SelectionStart" Value="0" />
        <Setter Property="SelectionEnd" Value="{Binding Path=Value, RelativeSource={RelativeSource Self}}" />
        <Setter Property="Template" Value="{StaticResource PositionSliderTemplate}" />
    </Style>

    <!-- Custom Slider Control -->
    <ControlTemplate x:Key="CustomSliderThumbTemplate" TargetType="{x:Type Thumb}">
        <Grid HorizontalAlignment="Center" UseLayoutRounding="True" VerticalAlignment="Center">
            <Rectangle x:Name="grip" Fill="{DynamicResource WindowTextForeground}" Width="5"
                       Height="{Binding Path=Height, RelativeSource={RelativeSource TemplatedParent}}"
                       StrokeThickness="0"
                       UseLayoutRounding="True" Stretch="Fill" RadiusX="3" RadiusY="3" />
        </Grid>
        <ControlTemplate.Triggers>
            <Trigger Property="IsDragging" Value="true">
                <Setter Property="Fill" TargetName="grip" Value="{DynamicResource WindowTextForeground}" />
            </Trigger>
            <Trigger Property="IsEnabled" Value="false">
                <Setter Property="Fill" TargetName="grip" Value="{DynamicResource MainWindowBackground}" />
            </Trigger>
            <Trigger Property="IsKeyboardFocused" Value="False">
                <Setter Property="Fill" TargetName="grip" Value="{DynamicResource WindowTextForeground}" />
            </Trigger>
        </ControlTemplate.Triggers>
    </ControlTemplate>
    <ControlTemplate x:Key="CustomSliderTemplate" TargetType="{x:Type Slider}">
        <Border x:Name="border" Background="Transparent" SnapsToDevicePixels="True">
            <Grid>
                <Grid.RowDefinitions>
                    <RowDefinition Height="{TemplateBinding MinHeight}" />
                </Grid.RowDefinitions>
                <DockPanel LastChildFill="True">
                    <Border ClipToBounds="True" x:Name="PART_SelectionRange" Height="1" Visibility="Visible">
                        <Rectangle RadiusX="1" RadiusY="1" Margin="4,0,-2,0"
                                   Fill="{DynamicResource WindowTextForeground}" />
                    </Border>
                    <Border ClipToBounds="True" Height="1" Visibility="Visible">
                        <Rectangle x:Name="PART_NegativeSelection" RadiusX="1" RadiusY="1" Margin="-2,0,4,0"
                                   Fill="{DynamicResource WindowTextForegroundAlternative}" />
                    </Border>
                </DockPanel>
                <Track x:Name="PART_Track">
                    <Track.Thumb>
                        <Thumb x:Name="Thumb" Focusable="False" Width="5" Height="{TemplateBinding MinHeight}"
                               OverridesDefaultStyle="True" Template="{StaticResource CustomSliderThumbTemplate}"
                               VerticalAlignment="Center" />
                    </Track.Thumb>
                </Track>
            </Grid>
        </Border>
    </ControlTemplate>
    <Style x:Key="CustomSliderStyle" TargetType="{x:Type Slider}">
        <Setter Property="Stylus.IsPressAndHoldEnabled" Value="false" />
        <Setter Property="Background" Value="Transparent" />
        <Setter Property="BorderBrush" Value="Transparent" />
        <Setter Property="MinHeight" Value="14" />
        <Setter Property="MaxHeight" Value="14" />
        <Setter Property="Height" Value="14" />
        <Setter Property="Minimum" Value="0" />
        <Setter Property="IsSnapToTickEnabled" Value="True" />
        <Setter Property="SmallChange" Value="0.01" />
        <Setter Property="LargeChange" Value="0.01" />
        <Setter Property="Focusable" Value="False" />
        <Setter Property="TickFrequency" Value="0.01" />
        <Setter Property="AutoToolTipPlacement" Value="None" />
        <Setter Property="IsMoveToPointEnabled" Value="True" />
        <Setter Property="VerticalAlignment" Value="Center" />
        <Setter Property="SelectionStart" Value="{Binding Path=Minimum, RelativeSource={RelativeSource Self}}" />
        <Setter Property="SelectionEnd" Value="{Binding Path=Value, RelativeSource={RelativeSource Self}}" />
        <Setter Property="Template" Value="{StaticResource CustomSliderTemplate}" />
    </Style>
</ResourceDictionary>