PowerToys/src/modules/imageresizer/ui/Themes/Light.xaml

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
                    xmlns:markup="clr-namespace:MahApps.Metro.Markup;assembly=MahApps.Metro"
                    xmlns:markupWithAssembly="clr-namespace:MahApps.Metro.Markup;assembly=MahApps.Metro"
                    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
                    xmlns:options="http://schemas.microsoft.com/winfx/2006/xaml/presentation/options"
                    xmlns:system="clr-namespace:System;assembly=System.Runtime"
                    mc:Ignorable="options">

    <!--  Metadata  -->
    <system:String x:Key="Theme.Name">Light.Accent1</system:String>
    <system:String x:Key="Theme.Origin">PowerToysImageResizer</system:String>
    <system:String x:Key="Theme.DisplayName">Accent1 (Light)</system:String>
    <system:String x:Key="Theme.BaseColorScheme">Light</system:String>
    <system:String x:Key="Theme.ColorScheme">Accent1</system:String>
    <Color x:Key="Theme.PrimaryAccentColor">White</Color>

    <SolidColorBrush x:Key="SecondaryBackgroundBrush" Color="#FFe6e6e6" />
    <SolidColorBrush x:Key="PrimaryBackgroundBrush" Color="#FFFFFFFF" />
    <SolidColorBrush x:Key="PrimaryForegroundBrush" Color="#FF000000" />
    <SolidColorBrush x:Key="SecondaryForegroundBrush" Color="#FF7d7d7d" />
    <SolidColorBrush x:Key="PrimaryBorderBrush" Color="Transparent"/>
</ResourceDictionary>