NebulaLauncher/Nebula.Launcher/Views/Popup/TfaView.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:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
             xmlns:customControls="clr-namespace:Nebula.Launcher.Controls"
             xmlns:popup="clr-namespace:Nebula.Launcher.ViewModels.Popup"
             mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
             x:Class="Nebula.Launcher.Views.Popup.TfaView">
    <Design.DataContext>
        <popup:TfaViewModel />
    </Design.DataContext>
    <StackPanel HorizontalAlignment="Stretch" Spacing="25" VerticalAlignment="Center">
        <customControls:LocalizedLabel HorizontalAlignment="Center" LocalId="twofa-enabled"/> 
        <StackPanel Orientation="Horizontal" HorizontalAlignment="Center" Spacing="10" x:Name="TContainer">
            <Border BoxShadow="{StaticResource DefaultShadow}">
                <TextBox MaxLength="1"/>
            </Border>
            <Border BoxShadow="{StaticResource DefaultShadow}">
                <TextBox MaxLength="1"/>
            </Border>
            <Border BoxShadow="{StaticResource DefaultShadow}">
                <TextBox MaxLength="1"/>
            </Border>
            <Border BoxShadow="{StaticResource DefaultShadow}">
                <TextBox MaxLength="1"/>
            </Border>
            <Border BoxShadow="{StaticResource DefaultShadow}">
                <TextBox MaxLength="1"/>
            </Border>
            <Border BoxShadow="{StaticResource DefaultShadow}">
                <TextBox MaxLength="1"/>
            </Border>
        </StackPanel>
        <Border BoxShadow="{StaticResource DefaultShadow}" Background="{StaticResource DefaultSelected}" HorizontalAlignment="Center">
            <Button Click="Button_OnClick">
                <customControls:LocalizedLabel HorizontalAlignment="Center" Margin="15,5,15,5" LocalId="twofa-set"/>
            </Button>
        </Border>
    </StackPanel>
</UserControl>