App.xaml

<Application x:Class="WinnerApp.App"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:local="clr-namespace:WinnerApp"
             StartupUri="MainWindow.xaml">
    <Application.Resources>
        <Style TargetType="Button">
            <Setter Property="FontSize" Value="14"/>
            <Setter Property="FontWeight" Value="Bold"/>
            <Setter Property="Background" Value="#007ACC"/>
            <Setter Property="Foreground" Value="White"/>
            <Setter Property="BorderBrush" Value="#005A9E"/>
            <Setter Property="Padding" Value="10"/>
            <Setter Property="Margin" Value="5"/>
        </Style>
        <Style TargetType="ListBox">
            <Setter Property="FontSize" Value="14"/>
            <Setter Property="Margin" Value="10"/>
        </Style>
        <Style TargetType="Label">
            <Setter Property="FontSize" Value="16"/>
            <Setter Property="FontWeight" Value="Bold"/>
            <Setter Property="HorizontalAlignment" Value="Center"/>
            <Setter Property="Margin" Value="10"/>
        </Style>
    </Application.Resources>
</Application>