Xamarin.Forms: Apply a global style to any page

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The ApplyDerivedTypes attribute of the Style is key in order to have a global style for a ContentPage for example. In order to have a global style for any Page derived class, use the TargetType="Page": 

<Style TargetType="Page"
        ApplyToDerivedTypes="True">
    <Setter Property="BackgroundColor"
            Value="White" />
</Style>

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