The articles of incorporation may set forth:
Notwithstanding this subdivision, in the case of a close corporation any of the provisions referred to above may be validly included in a shareholders' agreement. Notwithstanding this subdivision, bylaws may require for all or any actions by the board the affirmative vote of a majority of the authorized number of directors. Nothing contained in this subdivision shall affect the enforceability, as between the parties thereto, of any lawful agreement not otherwise contrary to public policy.
Ca. Corp. Code § 204