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let redView = UIView()
    redView.backgroundColor = .red
    
    view.addSubview(redView)
    redView.translatesAutoresizingMaskIntoConstraints = false
    
    redView.topAnchor.constraint(equalTo: view.topAnchor, constant: 40).isActive = true
    redView.rightAnchor.constraint(equalTo: view.rightAnchor, constant: -40).isActive = true
    redView.leftAnchor.constraint(equalTo: view.leftAnchor, constant: 40).isActive = true
    redView.bottomAnchor.constraint(equalTo: view.bottomAnchor, constant: -100).isActive = true