@IBAction func Register(_ sender: Any) {
    print("successfully tapped")
}

@IBAction func switchViews(_ sender: UISegmentedControl) {
    if sender.selectedSegmentIndex == 0 {
        firstView.alpha = 1
        secondView.alpha = 0
        thirdView.alpha = 0
    } else if sender.selectedSegmentIndex == 1 {
        firstView.alpha = 0
        secondView.alpha = 1
        thirdView.alpha = 0
    } else if sender.selectedSegmentIndex == 2 {
        firstView.alpha = 0
        secondView.alpha = 0
        thirdView.alpha = 1
    }
}