WpfLearn/DemoProb/App.xaml

<Application x:Class="DemoProb.App"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:local="clr-namespace:DemoProb"
             StartupUri="MainWindow.xaml">
    <Application.Resources>

        <Style x:Key="ButtonMain" TargetType="Button">
            <Setter Property="Background" Value="#FF04A0FF"/>
            <Setter Property="Foreground" Value="White"/>
            <Setter Property="Width" Value="200"/>
            <Setter Property="Height" Value="30"/>
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="Button">
                        <Border x:Name="Border" Background="{TemplateBinding Background}" CornerRadius="10">
                            <ContentPresenter x:Name="Content" HorizontalAlignment="Center" VerticalAlignment="Center"/>
                        </Border>
                        <ControlTemplate.Triggers>
                            <Trigger Property="IsEnabled" Value="True">
                                <Setter Property="Cursor" Value="Hand"/>
                            </Trigger>
                        </ControlTemplate.Triggers>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>

        <Style x:Key="ButtonNavigation" TargetType="Button">
            <Setter Property="Background" Value="#FF04A0FF"/>
            <Setter Property="Foreground" Value="Black"/>
            <Setter Property="FontFamily" Value="Segoe MDL2 Assets"/>
            <Setter Property="HorizontalAlignment" Value="Left"/>
            <Setter Property="Width" Value="90"/>
            <Setter Property="Height" Value="30"/>
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="Button">
                        <Border x:Name="Border" Background="{TemplateBinding Background}" CornerRadius="4">
                            <ContentPresenter x:Name="Content" HorizontalAlignment="Center" VerticalAlignment="Center"/>
                        </Border>
                        <ControlTemplate.Triggers>
                            <Trigger Property="IsEnabled" Value="True">
                                <Setter Property="Cursor" Value="Hand"/>
                            </Trigger>
                        </ControlTemplate.Triggers>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>
    </Application.Resources>
</Application>