Sklad/SkladProject/MainWindow.xaml

<Window x:Class="SkladProject.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:materialDesign="http://materialdesigninxaml.net/winfx/xaml/themes"
        xmlns:local="clr-namespace:SkladProject"
        mc:Ignorable="d"
        Title="MainWindow" Height="400" Width="350" Icon="Image/icon.png" WindowStartupLocation="CenterScreen" ResizeMode="NoResize" WindowStyle="None" AllowsTransparency="True" Background="Transparent">
    <Grid MouseDown="Grid_MouseDown">
        <Border Name="background" Background="#FFBEBDBF" CornerRadius="20,20,20,20"/>
        <Border Margin="0,0,0.4,282" CornerRadius="20,20,0,0">
            <Border.Background>
                <ImageBrush ImageSource="Image/sklad.jpg"/>
            </Border.Background>
        </Border>
        <Label Content="Авторизация" FontFamily="Century Gothic" HorizontalContentAlignment="Center" HorizontalAlignment="Center" Margin="0,169,0.4,193" VerticalAlignment="Center" Width="350" FontWeight="Bold" FontSize="24"/>
        <StackPanel Orientation="Vertical" Margin="60,208,60.4,86">
            <StackPanel Orientation="Horizontal" Margin="0,20,0,0">
                <materialDesign:PackIcon Kind="User" Width="30" Height="30" Foreground="#010101" HorizontalAlignment="Center" VerticalAlignment="Center"/>
                <TextBox Name="logintxt" Margin="5,0,0,0" FontSize="18" FontFamily="Century Gothic" Foreground="#010101" MaxLength="10" materialDesign:TextFieldAssist.UnderlineBrush="#010101" materialDesign:HintAssist.Hint="Введите логин" Width="195" TextChanged="logintxt_TextChanged"/>
            </StackPanel>
            <StackPanel Orientation="Horizontal" Margin="0,10,0,0">
                <materialDesign:PackIcon Kind="Password" Width="30" Height="30" Foreground="#010101" HorizontalAlignment="Center" VerticalAlignment="Center"/>
                <PasswordBox Name="passwordtxt" Margin="5,0,0,0" FontSize="18" FontFamily="Century Gothic" Foreground="#010101" MaxLength="10" materialDesign:TextFieldAssist.UnderlineBrush="#010101" materialDesign:HintAssist.Hint="Введите пароль" Width="195" PasswordChanged="passwordtxt_PasswordChanged"/>
            </StackPanel>
        </StackPanel>
        <Button Content="Войти" BorderThickness="0" Background="#010101" materialDesign:ButtonAssist.CornerRadius="10" HorizontalAlignment="Center"  VerticalAlignment="Center" Width="108"  Height="37" Margin="121,338,121.4,25" Click="Vhod_Click"/>
        <Button x:Name="WinMin" Style="{StaticResource MaterialDesignIconButton}" Margin="244,123,58.4,229" Click="WinMin_Click">
            <materialDesign:PackIcon Kind="WindowMinimize" Foreground="#010101"/>
        </Button>
        <Button x:Name="Exit" Style="{StaticResource MaterialDesignIconButton}" Margin="292,123,10.4,229" Click="Exit_Click">
            <materialDesign:PackIcon Kind="WindowClose" Foreground="#010101"/>
        </Button>
    </Grid>
</Window>