savelev_avt/MainWindow.xaml

<Window x:Class="savelev_avtor.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:savelev_avtor"
        mc:Ignorable="d"
        Title="MainWindow" Height="450.186" Width="821.655">
    <Grid RenderTransformOrigin="0.484,0.497">
        <Grid.RowDefinitions>
            <RowDefinition Height="111*"/>
            <RowDefinition Height="235*"/>
            <RowDefinition Height="111*"/>
        </Grid.RowDefinitions>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="222*"/>
            <ColumnDefinition Width="295*"/>
            <ColumnDefinition Width="222*"/>
        </Grid.ColumnDefinitions>
        <Grid HorizontalAlignment="Left" Height="100" Margin="190,85,0,0" VerticalAlignment="Top" Width="100" RenderTransformOrigin="0.305,0.706" Grid.Column="1" Grid.Row="1"/>
        <Rectangle Fill="#FFF4F4F5" HorizontalAlignment="Left" Height="423" Margin="2,-5,-2.47,0" Stroke="Black" VerticalAlignment="Top" Width="815" Grid.ColumnSpan="3" Grid.RowSpan="3" StrokeThickness="0" RenderTransformOrigin="0.5,0.5">
            <Rectangle.RenderTransform>
                <TransformGroup>
                    <ScaleTransform/>
                    <SkewTransform/>
                    <RotateTransform Angle="-0.226"/>
                    <TranslateTransform/>
                </TransformGroup>
            </Rectangle.RenderTransform>
        </Rectangle>
        <Button Content="Назад" HorizontalAlignment="Left" Margin="26,10,0,0" VerticalAlignment="Top" Width="75"/>
        <Frame Content="MainFrame" Source="Pages/AuthPage.xaml" Grid.Row="1" Grid.Column="1"/>

    </Grid>
</Window>