kursach/veloprokat2/auth_test.xaml

<Window x:Class="veloprokat2.auth_test"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:veloprokat2"
        mc:Ignorable="d"
        Title="Авторизация тест" WindowState="Maximized" Icon="mountain_bike_sport_icon_123970.ico">
    <Grid Background="#EAF4F4">
        <Border MinWidth="400" Margin="15" Background="#FFFF" VerticalAlignment="Center" Padding="30" MaxWidth="550" CornerRadius="20">
            <Border.Effect>
                <DropShadowEffect BlurRadius="30" Color="LightGray" ShadowDepth="0"/>
            </Border.Effect>
            <StackPanel>
                <TextBlock Text="Компания 'Велопробег'" FontSize="30" FontWeight="Bold" Margin="0 0 20 0" HorizontalAlignment="Center"/>
                <TextBox Name="Login" Text="Введите логин"/>
                <PasswordBox Name="Pass"/>
                <Button Content="Войти" Margin="0 20 0 0" Click="Button_click"/>
                <Button Content="Выйти из программы" Margin="0 20 0 0"/>
            </StackPanel>
        </Border>
    </Grid>
</Window>