if !hamburgerMenuIsVisible {
        leadingC.constant =  150
        trailingC.constant = 150

        hamburgerMenuIsVisible = true
    } else {
        leadingC.constant = 0
        trailingC.constant = 0

        hamburgerMenuIsVisible = false
    }

    UIView.animate(withDuration: 0.2, delay: 0.0, options: .curveEaseIn, animations: {
        self.view.layoutIfNeeded()
    }) { (animationComplete) in
        print("The animation is complete.")
    }
}