BrowserPage.xaml

<Page x:Class="CheckinClient.BrowserPage"
      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:eo="http://schemas.essentialobjects.com/wpf/"
      xmlns:wv2="clr-namespace:Microsoft.Web.WebView2.Wpf;assembly=Microsoft.Web.WebView2.Wpf"
      mc:Ignorable="d" 
      d:DesignHeight="300" d:DesignWidth="300"
	  Title="Check-in"
      Style="{StaticResource pageBackground}" >

    <Grid x:Name="frmMain" Loaded="frmMain_Loaded">

        <Grid x:Name="frmWebBrowser">
            
            
            
            <wv2:WebView2 Name="wbWebBrowser" />

            <Popup x:Name="puOverlay" AllowsTransparency="True" PlacementTarget="{Binding ElementName=wbMain}" Opacity="0.5" Placement="Left" HorizontalOffset="100">
                <Button x:Name="btnClose" Width="100" Height="100" Opacity="0.01" BorderBrush="{x:Null}" FocusVisualStyle="{x:Null}" Click="btnClose_Click"></Button>
            </Popup>
        </Grid>
    </Grid>
</Page>