new/Views/LoginView.axaml

<UserControl xmlns="https://github.com/avaloniaui"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
			 xmlns:vm="using:YtYtAvalonia.ViewModels"
			 x:DataType="vm:MainWindowViewModel"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
             mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
             x:Class="YtYtAvalonia.View.LoginView">
	<Grid>
		<StackPanel HorizontalAlignment="Center" VerticalAlignment="Center">
			<StackPanel.Styles>
				<Style Selector="TextBox">
					<Setter Property="Background" Value="#F8FDFF"></Setter>
					<Setter Property="BorderBrush" Value="#008BC7"></Setter>
					<Setter Property="CornerRadius" Value="8"></Setter>
					<Setter Property="BorderThickness" Value="2"></Setter>
					<Setter Property="FontSize" Value="13"></Setter>
					<Setter Property="FontFamily" Value="Roboto"></Setter>
				</Style>
				<Style Selector="ComboBox">
					<Setter Property="Background" Value="#F8FDFF"></Setter>
					<Setter Property="BorderBrush" Value="#008BC7"></Setter>
					<Setter Property="CornerRadius" Value="8"></Setter>
					<Setter Property="BorderThickness" Value="2"></Setter>
					<Setter Property="FontSize" Value="13"></Setter>
					<Setter Property="FontFamily" Value="Roboto"></Setter>
					<Setter Property="Foreground" Value="Gray"></Setter>
				</Style>
				<Style Selector="Button:pointerover /template/ ContentPresenter">
					<Setter Property="Background" Value="#2B95BD"></Setter>
				</Style>
				<Style Selector="Button.Login:pointerover /template/ ContentPresenter">
					<Setter Property="Background" Value="White"></Setter>
					<Setter Property="Foreground" Value="#2B95BD"></Setter>
				</Style>
			</StackPanel.Styles>

			<TextBlock HorizontalAlignment="Center" Margin="0 0 0 30" FontFamily="Roboto" FontSize="25" FontWeight="Bold">Авторизация</TextBlock>
			<TextBox Text="{Binding LoginVM.Login}" Watermark="Логин" Width="360" FontSize="13" Margin="0 0 0 10" ></TextBox>
			<TextBox Text="{Binding LoginVM.Password}" Watermark="Пароль" PasswordChar="•" Width="360" ></TextBox>
			<TextBlock Text="{Binding LoginVM.Message}"/>
			<Button HorizontalAlignment="Center" Margin="0 20 0 10" Width="230" Height="45" CornerRadius="10" Background="#38BFF2" Command="{Binding LoadPersonalAccount}">
				<TextBlock HorizontalAlignment="Center" VerticalAlignment="Center" FontFamily="Roboto" FontSize="16" FontWeight="DemiBold" Foreground="White">Войти</TextBlock>
			</Button>
			<StackPanel HorizontalAlignment="Center" Orientation="Horizontal">
				<TextBlock Text="Нет аккаунта?" FontFamily="Roboto" FontSize="14" VerticalAlignment="Center"></TextBlock>
				<Button Classes="Login" FontFamily="Roboto" FontSize="14" Background="White" Command="{Binding $parent[Window].((vm:MainWindowViewModel)DataContext).LoadRegistrationView}">Зарегистироваться</Button>
			</StackPanel>
		</StackPanel>
	</Grid>
</UserControl>