unable to change the button size

Not been able to change the button size. {see picture}

var LogInButton = new Button {
                Text = "Log In",
                TextColor = Color.White,
                BackgroundColor = Color.FromHex ("#2196F3"),
                Font = Font.SystemFontOfSize( 20 ),
                WidthRequest = 25,
                HeightRequest = 40,


        };