// class MainTabController

let actionButton = UIButton(type: .system).then {
    $0.tintColor = .systemBackground
    $0.backgroundColor = .systemCyan
    $0.setImage(UIImage(named: "new_tweet"), for: .normal)
    $0.layer.cornerRadius = 28
}

func configureUI() {
    view.addSubview(actionButton)
    actionButton.snp.makeConstraints {
        $0.height.width.equalTo(56)
        $0.bottom.equalTo(view.safeAreaLayoutGuide).inset(64)
        $0.trailing.equalTo(view.safeAreaLayoutGuide).inset(16)
    }
}