8 Del. C. § 216 — Quorum and required vote for stock corporations

Subject to this chapter in respect of the vote that shall be required for a specified action, the certificate of incorporation or bylaws of any corporation authorized to issue stock may specify the number of shares and/or the amount of other securities having voting power the holders of which shall be present or represented by proxy at any meeting in order to constitute a quorum for, and the votes that shall be necessary for, the transaction of any business, but in no event shall a quorum consist of less than 1/3 of the shares entitled to vote at the meeting, except that, where a separate vote by a class or series or classes or series is required, a quorum shall consist of no less than 1/3 of the shares of such class or series or classes or series. In the absence of such specification in the certificate of incorporation or bylaws of the corporation:

A bylaw amendment adopted by stockholders which specifies the votes that shall be necessary for the election of directors shall not be further amended or repealed by the board of directors.