override func viewDidLoad() {
    super.viewDidLoad()

    // Add profileImage to view and constraint it to center of the screen
    view.addSubview(profileImage)
    profileImage.centerXAnchor.constraint(equalTo: view.centerXAnchor).isActive = true
    profileImage.centerYAnchor.constraint(equalTo: view.centerYAnchor, constant: -100).isActive = true
    profileImage.widthAnchor.constraint(equalToConstant: 100).isActive = true
    profileImage.heightAnchor.constraint(equalToConstant: 100).isActive = true
 }