DontHarm/src/DontHarmDesktop/Pages/AuthPage.xaml

<Page x:Class="DontHarmDesktop.Pages.AuthPage"
      xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
      xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
      xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
      xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
      xmlns:local="clr-namespace:DontHarmDesktop.Pages" xmlns:viewmodels="clr-namespace:DontHarmDesktop.ViewModels" d:DataContext="{d:DesignInstance Type=viewmodels:AuthViewModel}"
      mc:Ignorable="d" 
      d:DesignHeight="450" d:DesignWidth="800"
      Title="AuthPage"
      ShowsNavigationUI="False">

    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="Auto"/>
            <RowDefinition Height="Auto"/>
            <RowDefinition Height="Auto"/>
            <RowDefinition Height="48"/>
        </Grid.RowDefinitions>

        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="0.25*"/>
            <ColumnDefinition Width="*"/>
            <ColumnDefinition Width="0.25*"/>
        </Grid.ColumnDefinitions>

        <TextBlock
            Grid.Row="0" 
            Grid.Column="1"
            TextAlignment="Center"
            HorizontalAlignment="Center"
            Padding="8"
            FontSize="18">
            Добро пожаловать в Не навреди!<LineBreak/>Пожалуйста, авторизуйтесь
        </TextBlock>

        <Grid Margin="5" Grid.Row="1" Grid.Column="1">
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="*"/>
                <ColumnDefinition Width="*"/>
            </Grid.ColumnDefinitions>
            <Label 
                HorizontalContentAlignment="Right" 
                Grid.Column="0"
                VerticalAlignment="Center">
                Логин
            </Label>
            <TextBox
                VerticalContentAlignment="Center"
                Grid.Column="1" Text="{Binding Login}"/>
        </Grid>

        <Grid Margin="5" Grid.Row="2" Grid.Column="1">
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="*"/>
                <ColumnDefinition Width="*"/>
            </Grid.ColumnDefinitions>

            <Label 
                HorizontalContentAlignment="Right" 
                Grid.Column="0"
                VerticalAlignment="Center">Пароль</Label>
            <TextBox
                VerticalContentAlignment="Center"
                Text="{Binding Password}" Grid.Column="1"></TextBox>
        </Grid>
        
        <Button 
            Margin="5"
            Grid.Row="3"
            Command="{Binding LoginCmd}"
            Grid.Column="1">Вход</Button>
    </Grid>
</Page>