AbsoluteOverElement.xaml

<?xml version="1.0" encoding="utf-8"?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms" 
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml" 
             xmlns:local="clr-namespace:AbsoluteLayoutSample" 
             x:Class="AbsoluteLayoutSample.AbsoluteLayoutSamplePage">
    
    <AbsoluteLayout VerticalOptions="CenterAndExpand">
         <Image Source="mountainPhoto" 
                Aspect="AspectFit" 
                AbsoluteLayout.LayoutBounds="0,0,1,200" 
                AbsoluteLayout.LayoutFlags="XProportional,YProportional, WidthProportional"/>
         <Label AbsoluteLayout.LayoutBounds="0,1,1,40" 
                AbsoluteLayout.LayoutFlags="XProportional,YProportional, WidthProportional" Text="Mountain Green" TextColor="White" VerticalOptions="End" HorizontalOptions="FillAndExpand">
          <Label.BackgroundColor>
              <Color x:FactoryMethod="FromHsla">
                  <x:Arguments>
                    <x:Double>0</x:Double>
                    <x:Double>0</x:Double>
                    <x:Double>0</x:Double>
                    <x:Double>0.6</x:Double>
                  </x:Arguments>
                </Color>
           </Label.BackgroundColor>
         </Label>
     </AbsoluteLayout>
</ContentPage>