_Colors.xaml

<ResourceDictionary
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:Win10v1903="http://schemas.microsoft.com/winfx/2006/xaml/presentation?IsApiContractPresent(Windows.Foundation.UniversalApiContract, 8)">

    <SolidColorBrush x:Key="ThemeControlForegroundBaseHighBrush" Color="{ThemeResource SystemBaseHighColor}" />

    <AcrylicBrush x:Key="CustomAcrylicLuminosity" BackgroundSource="HostBackdrop" TintOpacity="0.8" Win10v1903:TintLuminosityOpacity="0.2" TintColor="SkyBlue" FallbackColor="SkyBlue" />

    <!--CustomAcrylicBrush-->
    <AcrylicBrush x:Key="CustomAcrylicBrush"
                          BackgroundSource="Backdrop"
                          TintOpacity="0.7"
                          TintColor="#FF000000"
                          FallbackColor="#2B2B2B" />

    <!--Albums flyer button background acrylic brush-->
    <AcrylicBrush x:Key="AlbumsFlyerButtonBackgroundAcrylic" BackgroundSource="Backdrop" TintOpacity="0.6" Win10v1903:TintLuminosityOpacity="0.6" TintColor="Black" FallbackColor="Gray" />

    <!--Slider thumb background acrylic brush-->
    <AcrylicBrush x:Key="SliderThumbBackgroundAcrylicBrush" BackgroundSource="Backdrop" TintOpacity="0" FallbackColor="#4E4E4E" />

    <!-- Media Player background acrylic brush -->
    <AcrylicBrush x:Key="MediaPlayerBakgroundAcrylicBrush" BackgroundSource="Backdrop" TintOpacity="0.75" Win10v1903:TintLuminosityOpacity="0.8" TintColor="#103A3D" FallbackColor="#9C7E98" />

    <!--Navigation panel, "Detailed album page" background acrylic theme brush-->
    <ResourceDictionary.ThemeDictionaries>
        <ResourceDictionary x:Key="Light">
            <AcrylicBrush x:Key="NavigationViewDefaultPaneBackground"
                                 BackgroundSource="Backdrop"  TintColor="#88dbe4" TintOpacity="0.4" Win10v1903:TintLuminosityOpacity="0.5" FallbackColor="#d5d5d5" />
            <AcrylicBrush x:Key="NavigationViewTopPaneBackground"
                                 BackgroundSource="Backdrop"  TintColor="#88dbe4" TintOpacity="0.4" Win10v1903:TintLuminosityOpacity="0.8" FallbackColor="#d5d5d5" />
            <AcrylicBrush x:Key="NavigationViewExpandedPaneBackground"
                                 BackgroundSource="HostBackdrop" TintColor="#88dbe4" TintOpacity="0.6" Win10v1903:TintLuminosityOpacity="0.9" FallbackColor="#d5d5d5" />

            <AcrylicBrush x:Key="DetailedAlbumPageInAppAcrylic" BackgroundSource="Backdrop" TintOpacity="0.6" TintColor="DarkSlateGray" FallbackColor="#555" />
        </ResourceDictionary>
        <ResourceDictionary x:Key="Dark">
            <AcrylicBrush x:Key="NavigationViewDefaultPaneBackground"
                                 BackgroundSource="Backdrop"  TintColor="#165D63" TintOpacity="0.6" Win10v1903:TintLuminosityOpacity="0.5" FallbackColor="#444" />
            <!-- #165D63 -->
            <AcrylicBrush x:Key="NavigationViewTopPaneBackground"
                                 BackgroundSource="Backdrop"  TintColor="#165D63" TintOpacity="0.6" Win10v1903:TintLuminosityOpacity="0.8" FallbackColor="#444" />
            <AcrylicBrush x:Key="NavigationViewExpandedPaneBackground"
                                 BackgroundSource="HostBackdrop" TintColor="#165D63" TintOpacity="0.6" Win10v1903:TintLuminosityOpacity="0.9" FallbackColor="#444" />

            <AcrylicBrush x:Key="DetailedAlbumPageInAppAcrylic" BackgroundSource="Backdrop" TintOpacity="0.8" TintColor="Black" FallbackColor="#2B2B2B" />
        </ResourceDictionary>
        <ResourceDictionary x:Key="HighContrast">
            <SolidColorBrush x:Key="NavigationViewDefaultPaneBackground" Color="{ThemeResource SystemColorWindowColor}" />
            <SolidColorBrush x:Key="NavigationViewTopPaneBackground" Color="{ThemeResource SystemColorWindowColor}" />
            <SolidColorBrush x:Key="NavigationViewExpandedPaneBackground" Color="{ThemeResource SystemColorWindowColor}" />

            <SolidColorBrush x:Key="DetailedAlbumPageInAppAcrylic" Color="{ThemeResource SystemColorWindowColor}" />
        </ResourceDictionary>
    </ResourceDictionary.ThemeDictionaries>
</ResourceDictionary>