App.xaml

<Application x:Class="SalonApp.App"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             StartupUri="MainWindow.xaml">
    <Application.Resources>
        <Style TargetType="Button">
            <Setter Property="Width" Value="200"/>
            <Setter Property="Height" Value="25"/>
            <Setter Property="Background" Value="#FF16B0F7"/>
            <Setter Property="Foreground" Value="#fff"/>
            <Setter Property="BorderThickness" Value="0"/>
            <Setter Property="Cursor" Value="Hand"/>
            <Setter Property="FontFamily" Value="GOST Type BU"/>
            <Setter Property="FontSize" Value="15"/>
        </Style>
        <Style TargetType="TextBox">
            <Setter Property="Width" Value="200"/>
            <Setter Property="Height" Value="25"/>
        </Style>
        <Style TargetType="ComboBox">
            <Setter Property="Width" Value="200"/>
            <Setter Property="Height" Value="25"/>
        </Style>
        <Style TargetType="DatePicker">
            <Setter Property="Width" Value="200"/>
            <Setter Property="Height" Value="25"/>
        </Style>
    </Application.Resources>
</Application>