JoinViewController+Constraints.swift

extension JoinViewController {
    func setupConstraints() {
        view.addConstraints([
            buyerButton.centerXAnchor.constraint(equalTo: view.centerXAnchor),
            buyerButton.centerYAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerYAnchor, constant: -100),
            sellerButton.centerXAnchor.constraint(equalTo: view.centerXAnchor),
            sellerButton.centerYAnchor.constraint(equalTo: buyerButton.centerYAnchor, constant: 100)
        ])
    }
}