msfs-popout-panel-manager/WpfApp/TouchPanelWebViewDialog.xaml

<mah:MetroWindow x:Class="MSFSPopoutPanelManager.WpfApp.TouchPanelWebViewDialog"
                 xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                 xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
                 xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
                 xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
                 xmlns:mah="clr-namespace:MahApps.Metro.Controls;assembly=MahApps.Metro"
                 xmlns:wv2="clr-namespace:Microsoft.Web.WebView2.Wpf;assembly=Microsoft.Web.WebView2.Wpf"
                 mc:Ignorable="d"
        Title="Touch Panel" 
        Height="450" 
        Width="800"
        WindowStyle="None"
        AllowsTransparency="True"
        Closing="Window_Closing">
    <Window.Background>
        <SolidColorBrush Color="#FFF0F0F0" Opacity="0.01" />
    </Window.Background>
    <Grid>
        <wv2:WebView2 Name="webView" DefaultBackgroundColor="Transparent" HorizontalAlignment="Stretch" VerticalAlignment="Stretch"/>
    </Grid>
</mah:MetroWindow>