<Color x:Key="NeutralDark">#605e5d</Color>
<Color x:Key="NeutralLighter">#f4f4f4</Color>

<Style TargetType="Page" ApplyToDerivedTypes="True">
    <Setter Property="BackgroundColor"
            Value="{AppThemeBinding Dark={StaticResource NeutralDark}, Light={StaticResource NeutralLighter}}"/>
        
</Style>