func textFieldDidBeginEditing(_ textField: UITextField) {
        textField.layer.borderWidth = 2.0
        textField.layer.borderColor = UIColor(red: 0, green: 0.259, blue: 0.424, alpha: 1).cgColor
        textField.layer.cornerRadius = 4
        textField.layer.shadowColor = UIColor(red: 0, green: 0.455, blue: 0.722, alpha: 0.5).cgColor