Can you provide a way to set the Top header and bottom tab bar area to black in Xamarin Forms shell on iOS

I have a Xamarin forms application repro on Github that I use to evaluate new features. In this Xamarin forms shell app I set the colors as follows: <Shell xmlns="[login to view URL]" xmlns:x="[login to view URL]" BackgroundColor="#000000" TabBarBackgroundColor="#000000" These areas do not appear as black in iOS. Instead they appear as a very very dark gray color. I am looking for a person who can look into this and change this so the colors display correctly. I believe this will need a custom iOS renderer as I think iOS sets something in the header and nav areas such as opacity or some other property that causes a black 000000 to appear a very dark gray and not a perfect black. **** The person who does this work must be able to test it out their with an iOS simulator or iOS device. It must also work on Android but from what I have observed it currently works okay so there would be no need to add change things for Andoid. You will need to download the repro, implement a fix and upload the solution. I will provide access to the repro to the person who I accept to work on the project. ****