Creating a Color in XAML

gistfile1.txt

<?xml version="1.0" encoding="UTF-8" ?>
<ContentPage x:Class="TestXaml.MainPage"
    xmlns="http://xamarin.com/schemas/2014/forms"
    xmlns:me="clr-namespace:TestXaml;assembly=TestXaml"
    xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml">
       
       <StackLayout Spacing="10">

           <StackLayout.Resources>
              <ResourceDictionary>
                  <Color x:Key="ButtonBkColor">
                    <x:Arguments>
                        <x:Double>.95</x:Double>
                        <x:Double>.73</x:Double>
                        <x:Double>.4</x:Double>
                    </x:Arguments>
                  </Color>
                  <Color x:Key="ButtonTxtColor">
                   <x:Arguments>
                        <x:Double>.4</x:Double> <!-- R/255 -->
                        <x:Double>.62</x:Double>
                        <x:Double>.95</x:Double>
                    </x:Arguments>
                  </Color>
              </ResourceDictionary>
           </StackLayout.Resources>

           <Button Text="Button #1"
                BackgroundColor="{StaticResource ButtonBkColor}"
                TextColor="{StaticResource ButtonTxtColor}" />

       </StackLayout>

</ContentPage>