KursachMukha/KursachMukha692gr/MainWindow.xaml

<Window x:Class="KursachMukha692gr.MainWindow"
        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:KursachMukha692gr"
       xmlns:materialDesign="http://materialdesigninxaml.net/winfx/xaml/themes"
        mc:Ignorable="d" 
        Title="Основное окно" Height="350" Width="472" WindowStartupLocation="CenterScreen" VerticalAlignment="Bottom" HorizontalAlignment="Stretch" ScrollViewer.HorizontalScrollBarVisibility="Disabled">
    <Grid Background="#028E9B">
        <Border MinWidth="400" MaxWidth="400" Margin="15" Background="#35C0CD" VerticalAlignment="Center" Padding="30">
            <StackPanel>
                <Button  Margin="0 20" Content="Регистрация администратора" Background="#006363" Click="Button_Click_2"/>
                <Button VerticalAlignment="Center" Margin="0 20" Content="Войти как администратор" Click="Button_Click" Background="#006363	" />
            </StackPanel>
        </Border>
    </Grid>
</Window>