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How to Blur a Background With Acrylic

```python

from winrt.windows.ui.composition import SpriteVisual

from winrt.windows.ui.xaml import xaml_shadow

visual = SpriteVisual()

# Create an acrylic brush.

acrylic = xaml_shadow.AcrylicBrush()

acrylic.BackgroundSource = xaml_shadow.AcrylicBackgroundSource.HostBackdrop

# Apply the acrylic brush to the background of the visual.

visual.Brush = acrylic

# Set the blur amount for the acrylic effect.

acrylic.BlurAmount = 20.0

# Set the opacity of the acrylic effect.

acrylic.FallbackColor = xaml_shadow.ColorHelper.FromArgb(100, 255, 255, 255)

# Set the visual as the background of the application.

XamlRoot.Content = visual

```