LANCommander/LANCommander.Launcher/Views/Components/CoverButton.axaml

<UserControl xmlns="https://github.com/avaloniaui"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:vmComponents="using:LANCommander.Launcher.ViewModels.Components"
             xmlns:local="using:LANCommander.Launcher.Views.Components"
             x:Class="LANCommander.Launcher.Views.Components.CoverButton"
             x:DataType="vmComponents:GameItemViewModel"
             ClipToBounds="False">

    <UserControl.Styles>
        <Style Selector="Button.CoverButton">
            <Setter Property="Padding" Value="0" />
            <Setter Property="Background" Value="Transparent" />
            <Setter Property="BorderThickness" Value="0" />
            <Setter Property="CornerRadius" Value="0" />
            <Setter Property="RenderTransform" Value="scale(1)" />
            <Setter Property="Transitions">
                <Setter.Value>
                    <Transitions>
                        <TransformOperationsTransition Property="RenderTransform" Duration="0:0:0.18" Easing="CubicEaseOut" />
                    </Transitions>
                </Setter.Value>
            </Setter>
        </Style>
        <Style Selector="Button.CoverButton:pointerover">
            <Setter Property="RenderTransform" Value="scale(1.1)" />
        </Style>
        <Style Selector="Button.CoverButton Border.CoverShadow">
            <Setter Property="BoxShadow" Value="0 0 64 32 #FF000000" />
            <Setter Property="Opacity" Value="0" />
            <Setter Property="Transitions">
                <Setter.Value>
                    <Transitions>
                        <DoubleTransition Property="Opacity" Duration="0:0:0.18" />
                    </Transitions>
                </Setter.Value>
            </Setter>
        </Style>
        <Style Selector="Button.CoverButton:pointerover Border.CoverShadow">
            <Setter Property="Opacity" Value="1" />
        </Style>
        <Style Selector="Button.CoverButton Border.GlassOverlay">
            <Setter Property="Opacity" Value="0" />
            <Setter Property="Transitions">
                <Setter.Value>
                    <Transitions>
                        <DoubleTransition Property="Opacity" Duration="0:0:0.2" />
                    </Transitions>
                </Setter.Value>
            </Setter>
        </Style>
        <Style Selector="Button.CoverButton:pointerover Border.GlassOverlay">
            <Setter Property="Opacity" Value="1" />
        </Style>

        <!-- Keyboard/gamepad focus: same visual treatment as hover -->
        <Style Selector="Button.CoverButton:focus-visible">
            <Setter Property="RenderTransform" Value="scale(1.1)" />
        </Style>
        <Style Selector="Button.CoverButton:focus-visible Border.CoverShadow">
            <Setter Property="Opacity" Value="1" />
        </Style>
        <Style Selector="Button.CoverButton:focus-visible Border.GlassOverlay">
            <Setter Property="Opacity" Value="1" />
        </Style>
        <Style Selector="Button.CoverButton Border.FocusRing">
            <Setter Property="Opacity" Value="0" />
            <Setter Property="Transitions">
                <Setter.Value>
                    <Transitions>
                        <DoubleTransition Property="Opacity" Duration="0:0:0.15" />
                    </Transitions>
                </Setter.Value>
            </Setter>
        </Style>
        <Style Selector="Button.CoverButton:focus-visible Border.FocusRing">
            <Setter Property="Opacity" Value="1" />
        </Style>
    </UserControl.Styles>

    <Button Classes="CoverButton"
            HorizontalAlignment="Stretch"
            VerticalAlignment="Stretch"
            HorizontalContentAlignment="Stretch"
            VerticalContentAlignment="Stretch"
            ClipToBounds="False"
            Command="{Binding $parent[local:CoverButton].Command}"
            CommandParameter="{Binding $parent[local:CoverButton].CommandParameter}">
        <Panel>
            <Border Classes="CoverShadow"
                    HorizontalAlignment="Stretch"
                    VerticalAlignment="Stretch"
                    Background="Transparent"
                    IsHitTestVisible="False" />

            <local:Cover x:Name="CoverControl"
                         Source="{Binding CoverPath}"
                         MimeType="{Binding CoverMimeType}"
                         Title="{Binding Title}"
                         HorizontalAlignment="Stretch"
                         VerticalAlignment="Stretch"
                         IsHitTestVisible="False">
                <local:Cover.Overlay>
                    <Panel IsHitTestVisible="False">
                        <Border Classes="GlassOverlay" CornerRadius="0" IsHitTestVisible="False">
                            <Border.Background>
                                <LinearGradientBrush StartPoint="0%,0%" EndPoint="70%,100%">
                                    <GradientStop Color="#45FFFFFF" Offset="0" />
                                    <GradientStop Color="#10FFFFFF" Offset="0.45" />
                                    <GradientStop Color="#00FFFFFF" Offset="1" />
                                </LinearGradientBrush>
                            </Border.Background>
                        </Border>

                        <Border Background="#CC000000" CornerRadius="0"
                                HorizontalAlignment="Right" VerticalAlignment="Top"
                                Width="16" Height="16"
                                Margin="6"
                                IsVisible="{Binding ShowInLibraryBadge}">
                            <Icon Type="Regular" Value="Check" Width="9" Height="9"
                                  VerticalAlignment="Center" HorizontalAlignment="Center" />
                        </Border>
                    </Panel>
                </local:Cover.Overlay>
            </local:Cover>
            <Border Classes="FocusRing"
                    BorderBrush="#994096FF"
                    BorderThickness="2"
                    CornerRadius="4"
                    IsHitTestVisible="False"
                    HorizontalAlignment="Stretch"
                    VerticalAlignment="Stretch" />
        </Panel>
    </Button>

</UserControl>