Add a border to the web view - xamarin

Question

I'm working on a Xamarin Forms project using Visual studio 2017 , I want to add a border to the web view . with black color . how to do that view xaml is below .
<StackLayout Orientation="Vertical" BackgroundColor="White" HorizontalOptions="FillAndExpand">
<StackLayout Orientation="Horizontal" HeightRequest="60" HorizontalOptions="FillAndExpand" BackgroundColor="DarkBlue" Padding="5">
<Label x:Name="lblUserNewOnBoarding" WidthRequest="340" Text="New User Onboarding" FontAttributes="Bold" FontFamily="Roboto" FontSize="Large" TextColor="White"
HorizontalOptions="StartAndExpand" VerticalOptions="CenterAndExpand"></Label>
<Button x:Name="bntCancel" Text="Cancel" HeightRequest="40" BackgroundColor="#4184f3"
TextColor="White" HorizontalOptions="EndAndExpand" VerticalOptions="CenterAndExpand" Clicked="HandleCancle_Clicked" FontFamily="Roboto" FontSize="Small" FontAttributes="Bold">
<Button.Image>
<FileImageSource File="baseline_cancel_white_18dp.png" ></FileImageSource>
</Button.Image>
</Button>
</StackLayout>
<StackLayout Orientation="Vertical" HorizontalOptions="CenterAndExpand" >
<Label Text="Please agree to the following terms and conditions…" FontFamily="Roboto-Medium" FontSize="30"
HorizontalOptions="CenterAndExpand" WidthRequest="927" HeightRequest="168" Margin="5"
TextColor="Black"></Label>
<WebView x:Name="wvAgree" HeightRequest="300" WidthRequest="400" Margin="50" BackgroundColor="White" ></WebView>
<Button x:Name="btnAgree" Text="Agree" WidthRequest="190" HeightRequest="50" AnchorX="417" AnchorY="604"
BackgroundColor="#4184f3" TextColor="White" HorizontalOptions="Center" VerticalOptions="CenterAndExpand" Clicked="HandleAgree_Clicked" FontFamily="Roboto" FontSize="Small" FontAttributes="Bold">
<Button.Image >
<FileImageSource File="Agree.png"></FileImageSource>
</Button.Image>
</Button>
<Button x:Name="btnDisAgree" Text="Disagree" WidthRequest="190" HeightRequest="50" AnchorX="417" AnchorY="673" BackgroundColor="#4184f3"
TextColor="White" HorizontalOptions="Center" VerticalOptions="CenterAndExpand" Clicked="HandleDisAgree_Clicked" FontFamily="Roboto" FontSize="Small" FontAttributes="Bold">
<Button.Image>
<FileImageSource File="baseline_delete_48.png" ></FileImageSource>
</Button.Image>
</Button>
</StackLayout>
</StackLayout>

Answer 1

Wrap your WebView around Frame. So:
<Frame OutlineColor="Black">
<WebView x:Name="wvAgree" HeightRequest="300" WidthRequest="400" Margin="50" BackgroundColor="White"/>
</Frame>
Also you dont have to write a Additional closing Tag if you dont put anything between it. Pay attention how I closed that WebView tag.