App.xaml

<Application x:Class="FeatureHub.App"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:local="clr-namespace:FeatureHub"
             StartupUri="MainWindow.xaml"
             xmlns:materialDesign="http://materialdesigninxaml.net/winfx/xaml/themes">
    <Application.Resources>
        <ResourceDictionary>
            <ResourceDictionary.MergedDictionaries>
                <materialDesign:BundledTheme BaseTheme="Light" PrimaryColor="DeepPurple" SecondaryColor="Lime" />
                <ResourceDictionary Source="pack://application:,,,/MaterialDesignThemes.Wpf;component/Themes/MaterialDesignTheme.Defaults.xaml" />
            </ResourceDictionary.MergedDictionaries>

            <!-- Add the custom button style here -->
            <Style BasedOn="{StaticResource MaterialDesignFlatButton}" TargetType="Button">
                <Setter Property="Margin" Value="5"/>
                <Setter Property="Padding" Value="10,5"/>
                <Setter Property="FontSize" Value="18"/>
                <!-- Set the Material Design theme primary color as the default background color -->
                <Setter Property="Background" Value="{DynamicResource PrimaryHueMidBrush}"/>
                <Setter Property="Foreground" Value="#fdfefd"/>
                <Setter Property="BorderThickness" Value="0"/>
                <Setter Property="BorderBrush" Value="Transparent"/>
                <Setter Property="Cursor" Value="Hand"/>
                <Style.Triggers>
                    <Trigger Property="IsMouseOver" Value="True">
                        <Setter Property="Background" Value="#e0443c"/>
                    </Trigger>
                </Style.Triggers>
            </Style>
            <!-- End of custom button style -->

        </ResourceDictionary>
    </Application.Resources>

</Application>