Change the Window Background Color in Avalonia

Set the Background Color in XAML

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<Window xmlns="https://github.com/avaloniaui"
        xmlns:x="http://microsoft.com"
        x:Class="YourApp.MainWindow"
        Title="YourApp"
        Width="400" Height="300"
        Background="Black"> <!-- Set the background color here -->
        
    <TextBlock Text="The background color has been changed." HorizontalAlignment="Center" VerticalAlignment="Center"/>
</Window>

Set the Background property of the Window to a color name or a hexadecimal color code to change the window’s background color.

Common Colors

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You can specify either a color name or a hexadecimal color code for the Background property. The following table lists some commonly used colors for user interfaces.