kursach/veloprokat2/MainWindowAdm.xaml

<Window x:Class="veloprokat2.MainWindowAdm"
        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"
        xmlns:materialDesign="http://materialdesigninxaml.net/winfx/xaml/themes"
        Title="MainWindowAdm" Height="600" Width="800">
    <Grid Background="#EAF4F4">
        <Border MinWidth="400" Margin="15" Background="#FFFF" VerticalAlignment="Center" Padding="30" MaxWidth="600" CornerRadius="20">
            <Border.Effect>
                <DropShadowEffect BlurRadius="30" Color="LightGray" ShadowDepth="0"/>
            </Border.Effect>
            <StackPanel>
                <Button Content="Информация о пользователе"  Margin="0 0 0 20" Click="InfoPolz"/>
                <Button Content="Информация о продавцах" Margin="0 0 0 20" Click="InfoProd"/>
                <Button Content="Зарегестрировать нового продавца" Margin="0 0 0 20" Click="Registraciya"/>
                <Button Content="Зарегистрировать нового администратора" Margin=" 0 0 0 20" Click="NewAdm"/>
                <Button Content="Отмена" Margin="100 0 100 20" Click="Otmena"/>
            </StackPanel>
        </Border>
    </Grid>
</Window>