If you want the same color you can use
<Grid Background="#2E2E2E">
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In the product page of the Microsoft Store I noticed a large view with a shadow underneath it containing information about an app. Does anyone know which theme resource is being used as the background colour for this object?
I think something like this is being used:
<Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}"/>
If you want the same color you can use
<Grid Background="#2E2E2E">