override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.

    // Round the edges
    Login.layer.cornerRadius = 4
    Register.layer.cornerRadius = 4

    logo.translatesAutoresizingMaskIntoConstraints = false
    logo.centerXAnchor.constraint(equalTo: view.centerXAnchor).isActive = true
    logo.widthAnchor.constraint(equalToConstant: 200).isActive = true
    logo.heightAnchor.constraint(equalToConstant: 80).isActive = true
    logo.topAnchor.constraint(equalTo: view.topAnchor, constant: 90).isActive = true
    logo.contentMode = .scaleAspectFit

    letsloginTextField.translatesAutoresizingMaskIntoConstraints = false
    letsloginTextField.centerXAnchor.constraint(equalTo: view.centerXAnchor).isActive = true
    letsloginTextField.bottomAnchor.constraint(equalTo: logo.bottomAnchor, constant: 50).isActive = true

    emailTextField.translatesAutoresizingMaskIntoConstraints = false
    emailTextField.centerXAnchor.constraint(equalTo: view.centerXAnchor).isActive = true
    emailTextField.centerYAnchor.constraint(equalTo: view.centerYAnchor).isActive = true
    emailTextField.widthAnchor.constraint(equalToConstant: 180).isActive = true
    emailTextField.heightAnchor.constraint(equalToConstant: 30).isActive = true
    //emailTextField.bottomAnchor.constraint(equalTo: letsloginTextField.bottomAnchor, constant: 50).isActive = true


    passwordTextField.translatesAutoresizingMaskIntoConstraints = false
    passwordTextField.centerXAnchor.constraint(equalTo: view.centerXAnchor).isActive = true
    passwordTextField.widthAnchor.constraint(equalToConstant: 180).isActive = true
    passwordTextField.heightAnchor.constraint(equalToConstant: 30).isActive = true
    passwordTextField.bottomAnchor.constraint(equalTo: emailTextField.bottomAnchor, constant: 50).isActive = true

    Login.translatesAutoresizingMaskIntoConstraints = false
    Login.centerXAnchor.constraint(equalTo: view.centerXAnchor).isActive = true
    Login.widthAnchor.constraint(equalToConstant: 100).isActive = true
    Login.heightAnchor.constraint(equalToConstant: 30).isActive = true
    Login.bottomAnchor.constraint(equalTo: passwordTextField.bottomAnchor, constant: 60).isActive = true

    Register.translatesAutoresizingMaskIntoConstraints = false
    Register.centerXAnchor.constraint(equalTo: view.centerXAnchor).isActive = true
    Register.widthAnchor.constraint(equalToConstant: 100).isActive = true
    Register.heightAnchor.constraint(equalToConstant: 30).isActive = true
    Register.bottomAnchor.constraint(equalTo: Login.bottomAnchor, constant: 60).isActive = true

    // set delegates
    GIDSignIn.sharedInstance().uiDelegate = self
    //GIDSignIn.sharedInstance().signIn()

}

let width = UIScreen.main.bounds.size.width * 0.3
emailTextField.widthAnchor.constraint(equalToConstant: width).isActive = true

emailTextField.heightAnchor.constraint(equalToConstant: width * 0.5).isActive = true