PowerToys/Wox/Themes/Default.xaml

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
                    xmlns:system="clr-namespace:System;assembly=mscorlib">
    <Style x:Key="QueryBoxStyle" TargetType="{x:Type TextBox}">
        <Setter Property="BorderThickness" Value="0" />
        <Setter Property="FontSize" Value="25" />
        <Setter Property="FontWeight" Value="Medium" />
        <Setter Property="AllowDrop" Value="true" />
        <Setter Property="Height" Value="46" />
        <Setter Property="Background" Value="#616161" />
        <Setter Property="Foreground" Value="#E3E0E3" />
        <Setter Property="VerticalContentAlignment" Value="Center" />
        <Setter Property="Stylus.IsFlicksEnabled" Value="False" />
    </Style>
    <Style x:Key="WindowStyle" TargetType="{x:Type Window}">
        <Setter Property="Height" Value="80" />
        <Setter Property="Width" Value="500" />
        <Setter Property="Background" Value="#424242" />
    </Style>
    <Style x:Key="GridStyle" TargetType="{x:Type Grid}">
        <Setter Property="Margin" Value="8 10 8 8" />
    </Style>
    <Style x:Key="PendingLineStyle" TargetType="{x:Type Line}">
        <Setter Property="Stroke" Value="Blue" />
    </Style>

    <!-- Item Style -->
    <Style x:Key="ItemTitleStyle" TargetType="{x:Type TextBlock}">
        <Setter Property="Foreground" Value="#FFFFF8" />
        <Setter Property="FontSize" Value="16" />
        <Setter Property="FontWeight" Value="Medium" />
    </Style>
    <Style x:Key="ItemSubTitleStyle" TargetType="{x:Type TextBlock}">
        <Setter Property="Foreground" Value="#D9D9D4" />
    </Style>
    <Style x:Key="ItemStyle" TargetType="{x:Type UserControl}">
        <Setter Property="Background" Value="Transparent" />
        <Style.Triggers>
            <DataTrigger Binding="{Binding RelativeSource={RelativeSource Self}, Path=Selected}" Value="true">
                <Setter Property="Background" Value="#4F6180" />
            </DataTrigger>
        </Style.Triggers>
    </Style>

    <!-- ScrollViewer Style -->
    <ControlTemplate x:Key="ScrollViewerControlTemplate" TargetType="{x:Type ScrollViewer}">
        <Grid x:Name="Grid" Background="{TemplateBinding Background}">
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="*" />
                <ColumnDefinition Width="Auto" />
            </Grid.ColumnDefinitions>

            <!--content in the left of ScrollViewer, just default-->
            <ScrollContentPresenter x:Name="PART_ScrollContentPresenter"
                                        CanContentScroll="{TemplateBinding CanContentScroll}"
                                        CanHorizontallyScroll="False"
                                        CanVerticallyScroll="False"
                                        ContentTemplate="{TemplateBinding ContentTemplate}"
                                        Content="{TemplateBinding Content}"
                                        Grid.Column="0"
                                        Margin="{TemplateBinding Padding}"
                                        Grid.Row="0" />

            <!--Scrollbar in thr rigth of ScrollViewer-->
            <ScrollBar x:Name="PART_VerticalScrollBar"
                           AutomationProperties.AutomationId="VerticalScrollBar"
                           Cursor="Arrow"
                           Grid.Column="1"
                           Margin="3 0 0 0"
                           Maximum="{TemplateBinding ScrollableHeight}"
                           Minimum="0"
                           Grid.Row="0"
                           Visibility="{TemplateBinding ComputedVerticalScrollBarVisibility}"
                           Value="{Binding VerticalOffset, Mode=OneWay, RelativeSource={RelativeSource TemplatedParent}}"
                           ViewportSize="{TemplateBinding ViewportHeight}"
                           Style="{DynamicResource ScrollBarStyle}" />

        </Grid>
    </ControlTemplate>

    <!-- button style in the middle of the scrollbar -->
    <Style x:Key="ThumbStyle" TargetType="{x:Type Thumb}">
        <Setter Property="SnapsToDevicePixels" Value="True"/>
        <Setter Property="OverridesDefaultStyle" Value="true"/>
        <Setter Property="IsTabStop" Value="false"/>
        <Setter Property="Focusable" Value="false"/>
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type Thumb}">
                    <Border CornerRadius="2" DockPanel.Dock="Right" Background="#616161" BorderBrush="Transparent" BorderThickness="0" />
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>

    <Style x:Key="ScrollBarStyle" TargetType="{x:Type ScrollBar}">
        <Setter Property="Stylus.IsPressAndHoldEnabled" Value="false" />
        <Setter Property="Stylus.IsFlicksEnabled" Value="false" />
        <!-- must set min width -->
        <Setter Property="MinWidth" Value="0"/>
        <Setter Property="Width" Value="5"/>
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type ScrollBar}">
                    <DockPanel>
                        <Track x:Name="PART_Track" IsDirectionReversed="true" DockPanel.Dock="Right">
                            <Track.Thumb>
                                <Thumb Style="{DynamicResource ThumbStyle}"/>
                            </Track.Thumb>
                        </Track>
                    </DockPanel>
                </ControlTemplate>
            </Setter.Value>
        </Setter>

    </Style>
</ResourceDictionary>