LANCommander/LANCommander.Launcher/Views/Components/Cover.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:local="using:LANCommander.Launcher.Views.Components"
             mc:Ignorable="d" d:DesignWidth="160" d:DesignHeight="240"
             x:Class="LANCommander.Launcher.Views.Components.Cover">

    <Border HorizontalAlignment="Stretch"
            VerticalAlignment="Stretch"
            CornerRadius="0"
            ClipToBounds="True">
        <Panel>
            <Image x:Name="CoverImage"
                   Stretch="UniformToFill"
                   IsVisible="{Binding HasCover, RelativeSource={RelativeSource AncestorType=local:Cover}}" />

            <Border IsVisible="{Binding !HasCover, RelativeSource={RelativeSource AncestorType=local:Cover}}">
                <Border.Background>
                    <LinearGradientBrush StartPoint="0%,0%" EndPoint="100%,100%">
                        <GradientStop Color="#3D1A6B" Offset="0" />
                        <GradientStop Color="#0F3460" Offset="1" />
                    </LinearGradientBrush>
                </Border.Background>

                <TextBlock Text="{Binding Title, RelativeSource={RelativeSource AncestorType=local:Cover}}"
                           FontSize="{Binding FallbackFontSize, RelativeSource={RelativeSource AncestorType=local:Cover}}"
                           FontWeight="SemiBold"
                           TextWrapping="Wrap"
                           TextAlignment="Center"
                           HorizontalAlignment="Center"
                           VerticalAlignment="Center"
                           Margin="10"
                           Foreground="White" />
            </Border>

            <ContentPresenter Content="{Binding Overlay, RelativeSource={RelativeSource AncestorType=local:Cover}}" />
        </Panel>
    </Border>
</UserControl>