absolute layout on horizontal layout

I am trying to het the same view for portrait and for horizontal. I need the box view to be in the middle of the grey stack layout its ok on portrait but once I switch to horizontal layout the aquamarine box view Is at the end of the stacklayout. How do I get it in the middle for both layouts?

<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
                 xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
                 xmlns:local="clr-namespace:AbsolutePath"
                 x:Class="AbsolutePath.MainPage">
      <AbsoluteLayout>
            <AbsoluteLayout.Padding>
                <OnPlatform x:TypeArguments="Thickness">
                    <On Platform="iOS">0, 20, 0, 20</On>
                </OnPlatform>
            </AbsoluteLayout.Padding>
            <!--<BoxView Color="LightGray"
                     AbsoluteLayout.LayoutBounds="0, 0, 1, .35"
                     AbsoluteLayout.LayoutFlags="All"/>-->
            <StackLayout AbsoluteLayout.LayoutBounds=".1, .10, 1, .50" BackgroundColor="LightGray"
                       AbsoluteLayout.LayoutFlags="All">
                <Label Text="$11.95"
                       TextColor="Black"
                       FontSize="11"
                       FontAttributes="Bold"
                       HorizontalOptions="Start"/>
                <BoxView HeightRequest="200" BackgroundColor="Aquamarine" VerticalOptions="Center"
                         WidthRequest="350"
                       HorizontalOptions="Center"/>
            </StackLayout>
            <StackLayout AbsoluteLayout.LayoutBounds="0, 1, 1, .65"
                         AbsoluteLayout.LayoutFlags="All"
                         Padding="0, 10, 0, 0">
                <Label Text="Transaction History"
                       FontSize="15"
                       FontAttributes="Bold"
                       HorizontalOptions="Center"/>
                <ListView>
                    <ListView.ItemsSource>
                        <x:Array Type="{x:Type x:String}">
                            <x:String>Transaction Item              +$15.00               9/9/19</x:String>
                            <x:String>Transaction Item              +$15.00               9/9/19</x:String>
                            <x:String>Transaction Item              +$15.00               9/9/19</x:String>
                            <x:String>Transaction Item              +$15.00               9/9/19</x:String>
                            <x:String>Transaction Item              +$15.00               9/9/19</x:String>
                            <x:String>Transaction Item              +$15.00               9/9/19</x:String>
                        </x:Array>
                    </ListView.ItemsSource>
                </ListView>
           </StackLayout>
        </AbsoluteLayout>


</ContentPage>