DiscordChatExporter/DiscordChatExporter.Gui/App.xaml

<Application
    x:Class="DiscordChatExporter.Gui.App"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="clr-namespace:DiscordChatExporter.Gui"
    xmlns:s="https://github.com/canton7/Stylet">
    <Application.Resources>
        <s:ApplicationLoader>
            <!--  Bootstrapper  -->
            <s:ApplicationLoader.Bootstrapper>
                <local:Bootstrapper />
            </s:ApplicationLoader.Bootstrapper>

            <!--  Merged dictionaries  -->
            <ResourceDictionary.MergedDictionaries>
                <ResourceDictionary Source="pack://application:,,,/MaterialDesignThemes.Wpf;component/Themes/MaterialDesignTheme.Light.xaml" />
                <ResourceDictionary Source="pack://application:,,,/MaterialDesignThemes.Wpf;component/Themes/MaterialDesignTheme.Defaults.xaml" />
            </ResourceDictionary.MergedDictionaries>

            <!--  Colors  -->
            <Color x:Key="PrimaryColor">#343838</Color>
            <Color x:Key="PrimaryLightColor">#5E6262</Color>
            <Color x:Key="PrimaryDarkColor">#0D1212</Color>
            <Color x:Key="AccentColor">#F9A825</Color>
            <Color x:Key="AccentDarkColor">#C17900</Color>
            <Color x:Key="TextColor">#000000</Color>
            <Color x:Key="InverseTextColor">#FFFFFF</Color>

            <SolidColorBrush x:Key="PrimaryHueLightBrush" Color="{DynamicResource PrimaryLightColor}" />
            <SolidColorBrush x:Key="PrimaryHueLightForegroundBrush" Color="{DynamicResource InverseTextColor}" />
            <SolidColorBrush x:Key="PrimaryHueMidBrush" Color="{DynamicResource PrimaryColor}" />
            <SolidColorBrush x:Key="PrimaryHueMidForegroundBrush" Color="{DynamicResource InverseTextColor}" />
            <SolidColorBrush x:Key="PrimaryHueDarkBrush" Color="{DynamicResource PrimaryDarkColor}" />
            <SolidColorBrush x:Key="PrimaryHueDarkForegroundBrush" Color="{DynamicResource InverseTextColor}" />
            <SolidColorBrush x:Key="SecondaryAccentBrush" Color="{DynamicResource AccentColor}" />
            <SolidColorBrush x:Key="SecondaryAccentForegroundBrush" Color="{DynamicResource TextColor}" />

            <SolidColorBrush
                x:Key="PrimaryTextBrush"
                Opacity="0.87"
                Color="{DynamicResource TextColor}" />
            <SolidColorBrush
                x:Key="SecondaryTextBrush"
                Opacity="0.64"
                Color="{DynamicResource TextColor}" />
            <SolidColorBrush
                x:Key="DimTextBrush"
                Opacity="0.45"
                Color="{DynamicResource TextColor}" />
            <SolidColorBrush
                x:Key="PrimaryInverseTextBrush"
                Opacity="1"
                Color="{DynamicResource InverseTextColor}" />
            <SolidColorBrush
                x:Key="SecondaryInverseTextBrush"
                Opacity="0.7"
                Color="{DynamicResource InverseTextColor}" />
            <SolidColorBrush
                x:Key="DimInverseTextBrush"
                Opacity="0.52"
                Color="{DynamicResource InverseTextColor}" />
            <SolidColorBrush
                x:Key="AccentTextBrush"
                Opacity="1"
                Color="{DynamicResource AccentColor}" />
            <SolidColorBrush
                x:Key="AccentDarkTextBrush"
                Opacity="1"
                Color="{DynamicResource AccentDarkColor}" />
            <SolidColorBrush
                x:Key="DividerBrush"
                Opacity="0.12"
                Color="{DynamicResource TextColor}" />
            <SolidColorBrush
                x:Key="InverseDividerBrush"
                Opacity="0.12"
                Color="{DynamicResource InverseTextColor}" />

            <!--  Styles  -->
            <Style x:Key="MaterialDesignRoot" TargetType="{x:Type Control}">
                <Setter Property="FontFamily" Value="{DynamicResource MaterialDesignFont}" />
                <Setter Property="RenderOptions.BitmapScalingMode" Value="HighQuality" />
                <Setter Property="SnapsToDevicePixels" Value="True" />
                <Setter Property="TextElement.FontSize" Value="13" />
                <Setter Property="TextElement.FontWeight" Value="Regular" />
                <Setter Property="TextElement.Foreground" Value="{DynamicResource SecondaryTextBrush}" />
                <Setter Property="TextOptions.TextFormattingMode" Value="Ideal" />
                <Setter Property="TextOptions.TextRenderingMode" Value="Auto" />
                <Setter Property="UseLayoutRounding" Value="True" />
            </Style>

            <Style BasedOn="{StaticResource MaterialDesignLinearProgressBar}" TargetType="{x:Type ProgressBar}">
                <Setter Property="BorderThickness" Value="0" />
                <Setter Property="Foreground" Value="{DynamicResource SecondaryAccentBrush}" />
                <Setter Property="Height" Value="2" />
                <Setter Property="Maximum" Value="1" />
                <Setter Property="Minimum" Value="0" />
            </Style>

            <Style BasedOn="{StaticResource MaterialDesignTextBox}" TargetType="{x:Type TextBox}">
                <Setter Property="Foreground" Value="{DynamicResource PrimaryTextBrush}" />
            </Style>

            <Style BasedOn="{StaticResource MaterialDesignComboBox}" TargetType="{x:Type ComboBox}">
                <Setter Property="Foreground" Value="{DynamicResource PrimaryTextBrush}" />
            </Style>

            <Style BasedOn="{StaticResource MaterialDesignDatePicker}" TargetType="{x:Type DatePicker}">
                <Setter Property="Foreground" Value="{DynamicResource PrimaryTextBrush}" />
            </Style>

            <Style
                x:Key="MaterialDesignFlatDarkButton"
                BasedOn="{StaticResource MaterialDesignFlatButton}"
                TargetType="{x:Type Button}">
                <Style.Resources>
                    <SolidColorBrush x:Key="MaterialDesignFlatButtonClick" Color="#4C4C4C" />
                </Style.Resources>

                <Setter Property="Foreground" Value="{DynamicResource PrimaryHueMidForegroundBrush}" />
            </Style>

            <Style
                x:Key="MaterialDesignFlatActionToggleButton"
                BasedOn="{StaticResource MaterialDesignActionToggleButton}"
                TargetType="{x:Type ToggleButton}">
                <Setter Property="Background" Value="Transparent" />
                <Setter Property="Foreground" Value="{DynamicResource PrimaryHueMidBrush}" />

                <Style.Triggers>
                    <Trigger Property="IsMouseOver" Value="True">
                        <Setter Property="Background" Value="{DynamicResource MaterialDesignFlatButtonClick}" />
                        <Setter Property="BorderBrush" Value="{DynamicResource MaterialDesignFlatButtonClick}" />
                    </Trigger>
                </Style.Triggers>
            </Style>
        </s:ApplicationLoader>
    </Application.Resources>
</Application>