ModuleEkzKolesovAD/TestDemo/App.xaml

<Application x:Class="TestDemo.App"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:local="clr-namespace:TestDemo"
             StartupUri="MainWindow.xaml">
    <Application.Resources>
        <Style TargetType="TextBlock">
            <Setter Property="Foreground" Value="Black"></Setter>
            <Setter Property="FontFamily" Value="Bahnschrift SemiLight"></Setter>
        </Style>
        <Style TargetType="Border">
            <Setter Property="Background" Value="Yellow"></Setter>
            
        </Style>
        <Style TargetType="Button">
            <Setter Property="Background"  Value="White"></Setter>

        </Style>



    </Application.Resources>
</Application>