MainPage.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:XamarinBorderlessEntry"  
xmlns:Controls="clr-namespace:XamarinBorderlessEntry.Controls"  
x:Class="XamarinBorderlessEntry.MainPage">  
<ContentPage.Content>  
<StackLayout>  
<StackLayout HorizontalOptions="CenterAndExpand" VerticalOptions="CenterAndExpand">  
<Image Aspect="Fill" x:Name="imgBanner"></Image>  
<Entry Placeholder="Enter something here..."></Entry>  
</StackLayout>  
</StackLayout>  
</ContentPage.Content>  
</ContentPage>