PowerToys/src/modules/FileLocksmith/FileLocksmithUI/FileLocksmithXAML/App.xaml

<Application
    x:Class="FileLocksmithUI.App"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="using:FileLocksmithUI">
    <Application.Resources>
        <ResourceDictionary>
            <ResourceDictionary.MergedDictionaries>
                <XamlControlsResources xmlns="using:Microsoft.UI.Xaml.Controls" />
                <!--  Other merged dictionaries here  -->
            </ResourceDictionary.MergedDictionaries>

            <ResourceDictionary.ThemeDictionaries>
                <ResourceDictionary x:Key="Default">
                    <StaticResource x:Key="SubtleButtonBackground" ResourceKey="SubtleFillColorTransparent" />
                    <StaticResource x:Key="SubtleButtonBackgroundPointerOver" ResourceKey="SubtleFillColorSecondary" />
                    <StaticResource x:Key="SubtleButtonBackgroundPressed" ResourceKey="SubtleFillColorTertiary" />
                    <StaticResource x:Key="SubtleButtonBackgroundDisabled" ResourceKey="SubtleFillColorTransparent" />

                    <StaticResource x:Key="SubtleButtonBorderBrush" ResourceKey="SubtleFillColorTransparent" />
                    <StaticResource x:Key="SubtleButtonBorderBrushPointerOver" ResourceKey="SubtleFillColorSecondary" />
                    <StaticResource x:Key="SubtleButtonBorderBrushPressed" ResourceKey="SubtleFillColorTertiary" />
                    <StaticResource x:Key="SubtleButtonBorderBrushDisabled" ResourceKey="SubtleFillColorTransparent" />

                    <StaticResource x:Key="SubtleButtonForeground" ResourceKey="TextFillColorPrimary" />
                    <StaticResource x:Key="SubtleButtonForegroundPointerOver" ResourceKey="TextFillColorPrimary" />
                    <StaticResource x:Key="SubtleButtonForegroundPressed" ResourceKey="TextFillColorSecondary" />
                    <StaticResource x:Key="SubtleButtonForegroundDisabled" ResourceKey="TextFillColorDisabled" />
                </ResourceDictionary>

                <ResourceDictionary x:Key="Light">
                    <StaticResource x:Key="SubtleButtonBackground" ResourceKey="SubtleFillColorTransparent" />
                    <StaticResource x:Key="SubtleButtonBackgroundPointerOver" ResourceKey="SubtleFillColorSecondary" />
                    <StaticResource x:Key="SubtleButtonBackgroundPressed" ResourceKey="SubtleFillColorTertiary" />
                    <StaticResource x:Key="SubtleButtonBackgroundDisabled" ResourceKey="SubtleFillColorTransparent" />

                    <StaticResource x:Key="SubtleButtonBorderBrush" ResourceKey="SubtleFillColorTransparent" />
                    <StaticResource x:Key="SubtleButtonBorderBrushPointerOver" ResourceKey="SubtleFillColorSecondary" />
                    <StaticResource x:Key="SubtleButtonBorderBrushPressed" ResourceKey="SubtleFillColorTertiary" />
                    <StaticResource x:Key="SubtleButtonBorderBrushDisabled" ResourceKey="SubtleFillColorTransparent" />

                    <StaticResource x:Key="SubtleButtonForeground" ResourceKey="TextFillColorPrimary" />
                    <StaticResource x:Key="SubtleButtonForegroundPointerOver" ResourceKey="TextFillColorPrimary" />
                    <StaticResource x:Key="SubtleButtonForegroundPressed" ResourceKey="TextFillColorSecondary" />
                    <StaticResource x:Key="SubtleButtonForegroundDisabled" ResourceKey="TextFillColorDisabled" />
                </ResourceDictionary>

                <ResourceDictionary x:Key="HighContrast">
                    <StaticResource x:Key="SubtleButtonBackground" ResourceKey="SystemColorWindowColorBrush" />
                    <StaticResource x:Key="SubtleButtonBackgroundPointerOver" ResourceKey="SystemColorHighlightTextColorBrush" />
                    <StaticResource x:Key="SubtleButtonBackgroundPressed" ResourceKey="SystemColorWindowColorBrush" />
                    <StaticResource x:Key="SubtleButtonBackgroundDisabled" ResourceKey="SystemControlBackgroundBaseLowBrush" />

                    <StaticResource x:Key="SubtleButtonBorderBrush" ResourceKey="SystemColorWindowColorBrush" />
                    <StaticResource x:Key="SubtleButtonBorderBrushPointerOver" ResourceKey="SystemColorHighlightColorBrush" />
                    <StaticResource x:Key="SubtleButtonBorderBrushPressed" ResourceKey="SystemColorHighlightColorBrush" />
                    <StaticResource x:Key="SubtleButtonBorderBrushDisabled" ResourceKey="SystemColorGrayTextColor" />

                    <StaticResource x:Key="SubtleButtonForeground" ResourceKey="SystemColorButtonTextColorBrush" />
                    <StaticResource x:Key="SubtleButtonForegroundPointerOver" ResourceKey="SystemControlHighlightBaseHighBrush" />
                    <StaticResource x:Key="SubtleButtonForegroundPressed" ResourceKey="SystemControlHighlightBaseHighBrush" />
                    <StaticResource x:Key="SubtleButtonForegroundDisabled" ResourceKey="SystemControlDisabledBaseMediumLowBrush" />
                </ResourceDictionary>

            </ResourceDictionary.ThemeDictionaries>

            <Style x:Key="SubtleButtonStyle" TargetType="Button">
                <Setter Property="Background" Value="{ThemeResource SubtleButtonBackground}" />
                <Setter Property="BackgroundSizing" Value="InnerBorderEdge" />
                <Setter Property="Foreground" Value="{ThemeResource SubtleButtonForeground}" />
                <Setter Property="BorderBrush" Value="{ThemeResource SubtleButtonBorderBrush}" />
                <Setter Property="BorderThickness" Value="{ThemeResource ButtonBorderThemeThickness}" />
                <Setter Property="Padding" Value="{StaticResource ButtonPadding}" />
                <Setter Property="HorizontalAlignment" Value="Left" />
                <Setter Property="VerticalAlignment" Value="Center" />
                <Setter Property="FontFamily" Value="{ThemeResource ContentControlThemeFontFamily}" />
                <Setter Property="FontWeight" Value="Normal" />
                <Setter Property="FontSize" Value="{ThemeResource ControlContentThemeFontSize}" />
                <Setter Property="UseSystemFocusVisuals" Value="{StaticResource UseSystemFocusVisuals}" />
                <Setter Property="FocusVisualMargin" Value="-3" />
                <Setter Property="CornerRadius" Value="{ThemeResource ControlCornerRadius}" />
                <Setter Property="Template">
                    <Setter.Value>
                        <ControlTemplate TargetType="Button">
                            <ContentPresenter
                                x:Name="ContentPresenter"
                                Padding="{TemplateBinding Padding}"
                                HorizontalContentAlignment="{TemplateBinding HorizontalContentAlignment}"
                                VerticalContentAlignment="{TemplateBinding VerticalContentAlignment}"
                                AnimatedIcon.State="Normal"
                                AutomationProperties.AccessibilityView="Raw"
                                Background="{TemplateBinding Background}"
                                BackgroundSizing="{TemplateBinding BackgroundSizing}"
                                BorderBrush="{TemplateBinding BorderBrush}"
                                BorderThickness="{TemplateBinding BorderThickness}"
                                Content="{TemplateBinding Content}"
                                ContentTemplate="{TemplateBinding ContentTemplate}"
                                ContentTransitions="{TemplateBinding ContentTransitions}"
                                CornerRadius="{TemplateBinding CornerRadius}"
                                Foreground="{TemplateBinding Foreground}">
                                <ContentPresenter.BackgroundTransition>
                                    <BrushTransition Duration="0:0:0.083" />
                                </ContentPresenter.BackgroundTransition>
                                <VisualStateManager.VisualStateGroups>
                                    <VisualStateGroup x:Name="CommonStates">
                                        <VisualState x:Name="Normal" />
                                        <VisualState x:Name="PointerOver">
                                            <Storyboard>
                                                <ObjectAnimationUsingKeyFrames Storyboard.TargetName="ContentPresenter" Storyboard.TargetProperty="Background">
                                                    <DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SubtleButtonBackgroundPointerOver}" />
                                                </ObjectAnimationUsingKeyFrames>
                                                <ObjectAnimationUsingKeyFrames Storyboard.TargetName="ContentPresenter" Storyboard.TargetProperty="BorderBrush">
                                                    <DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SubtleButtonBorderBrushPointerOver}" />
                                                </ObjectAnimationUsingKeyFrames>
                                                <ObjectAnimationUsingKeyFrames Storyboard.TargetName="ContentPresenter" Storyboard.TargetProperty="Foreground">
                                                    <DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SubtleButtonForegroundPointerOver}" />
                                                </ObjectAnimationUsingKeyFrames>
                                            </Storyboard>
                                            <VisualState.Setters>
                                                <Setter Target="ContentPresenter.(AnimatedIcon.State)" Value="PointerOver" />
                                            </VisualState.Setters>
                                        </VisualState>
                                        <VisualState x:Name="Pressed">
                                            <Storyboard>
                                                <ObjectAnimationUsingKeyFrames Storyboard.TargetName="ContentPresenter" Storyboard.TargetProperty="Background">
                                                    <DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SubtleButtonBackgroundPressed}" />
                                                </ObjectAnimationUsingKeyFrames>
                                                <ObjectAnimationUsingKeyFrames Storyboard.TargetName="ContentPresenter" Storyboard.TargetProperty="BorderBrush">
                                                    <DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SubtleButtonBorderBrushPressed}" />
                                                </ObjectAnimationUsingKeyFrames>
                                                <ObjectAnimationUsingKeyFrames Storyboard.TargetName="ContentPresenter" Storyboard.TargetProperty="Foreground">
                                                    <DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SubtleButtonForegroundPressed}" />
                                                </ObjectAnimationUsingKeyFrames>
                                            </Storyboard>
                                            <VisualState.Setters>
                                                <Setter Target="ContentPresenter.(AnimatedIcon.State)" Value="Pressed" />
                                            </VisualState.Setters>
                                        </VisualState>
                                        <VisualState x:Name="Disabled">
                                            <Storyboard>
                                                <ObjectAnimationUsingKeyFrames Storyboard.TargetName="ContentPresenter" Storyboard.TargetProperty="Background">
                                                    <DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SubtleButtonBackgroundDisabled}" />
                                                </ObjectAnimationUsingKeyFrames>
                                                <ObjectAnimationUsingKeyFrames Storyboard.TargetName="ContentPresenter" Storyboard.TargetProperty="BorderBrush">
                                                    <DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SubtleButtonBorderBrushDisabled}" />
                                                </ObjectAnimationUsingKeyFrames>
                                                <ObjectAnimationUsingKeyFrames Storyboard.TargetName="ContentPresenter" Storyboard.TargetProperty="Foreground">
                                                    <DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SubtleButtonForegroundDisabled}" />
                                                </ObjectAnimationUsingKeyFrames>
                                            </Storyboard>
                                            <VisualState.Setters>
                                                <!--  DisabledVisual Should be handled by the control, not the animated icon.  -->
                                                <Setter Target="ContentPresenter.(AnimatedIcon.State)" Value="Normal" />
                                            </VisualState.Setters>
                                        </VisualState>
                                    </VisualStateGroup>
                                </VisualStateManager.VisualStateGroups>
                            </ContentPresenter>
                        </ControlTemplate>
                    </Setter.Value>
                </Setter>
            </Style>
        </ResourceDictionary>
    </Application.Resources>
</Application>