wabbajack/Wabbajack.App/App.axaml

<Application xmlns="https://github.com/avaloniaui"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:local="using:Wabbajack.App"
             x:Class="Wabbajack.App.App">
    <Application.DataTemplates>
        <local:ViewLocator />
    </Application.DataTemplates>

    <Application.Styles>
        <StyleInclude Source="avares://Material.Icons.Avalonia/App.xaml" />
        <FluentTheme Mode="Dark" />
        <StyleInclude Source="avares://Wabbajack.App/Assets/Wabbajack.axaml" />
        <Style Selector="Button:not(:pointerover) /template/ ContentPresenter">
            <Setter Property="Background" Value="Transparent" />
        </Style>


        <Style Selector="Button:pointerover /template/ ContentPresenter">
            <Setter Property="Background" Value="Transparent" />
            <Setter Property="BorderBrush" Value="LightGray" />
            <Setter Property="CornerRadius" Value="5" />
        </Style>
    </Application.Styles>
</Application>