[Theme: Twenty-fourteen] Using header image lengthens page

Enabling the static header image (of 1600×240 px) for our Twenty-Fourteen themed site causes the length of the page to be extended by 240px. As a result, even the shortest page extends beyond the bottom of the window by the height of the header image. I thought the theme would compensate for the added length the image and reduce the overall size of the page, but that isn’t the case. Is there any way to compensate for the added length that the header image adds to the page?