App.xaml

<?xml version="1.0" encoding="utf-8"?>
<Application
    x:Class="WorkdayCalculator.App"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="using:WorkdayCalculator">
    <Application.Resources>
        <ResourceDictionary>
            <ResourceDictionary.MergedDictionaries>
                <XamlControlsResources xmlns="using:Microsoft.UI.Xaml.Controls" />
                <!-- Other merged dictionaries here -->
            </ResourceDictionary.MergedDictionaries>
            <!-- Other app resources here -->
            <ResourceDictionary.ThemeDictionaries>
                <ResourceDictionary x:Key="Light">
                    <SolidColorBrush x:Key="HomePageBackgroundBrush" Color="Transparent" />
                    <StaticResource x:Key="GalleryBackgroundBrush" ResourceKey="SolidBackgroundFillColorBaseBrush" />
                    <StaticResource x:Key="GalleryBorderBrush" ResourceKey="CardStrokeColorDefaultBrush" />
                </ResourceDictionary>
                <ResourceDictionary x:Key="Dark">
                    <SolidColorBrush x:Key="HomePageBackgroundBrush" Color="Transparent" />
                    <StaticResource x:Key="GalleryBackgroundBrush" ResourceKey="SolidBackgroundFillColorBaseBrush" />
                    <StaticResource x:Key="GalleryBorderBrush" ResourceKey="CardStrokeColorDefaultBrush" />
                </ResourceDictionary>
                <ResourceDictionary x:Key="HighContrast">
                    <SolidColorBrush x:Key="HomePageBackgroundBrush" Color="{ThemeResource SystemColorWindowColor}" />
                    <SolidColorBrush x:Key="GalleryBackgroundBrush" Color="{ThemeResource SystemColorWindowColor}" />
                    <SolidColorBrush x:Key="GalleryBorderBrush" Color="{ThemeResource SystemColorWindowColor}" />
                </ResourceDictionary>
            </ResourceDictionary.ThemeDictionaries>
        </ResourceDictionary>
    </Application.Resources>
</Application>