Image in Header Middle being cut off at the bottom - Acquia Slate

I'm trying to put a header image in "header middle" block on my website. However, the bottom of the image is being cut off by the bottom of the white box. I've tried to size the image to fit the constraints of the white box, but it still causes problems. I'd like to image ideally to be seated in the top left of the box. You can see what I mean here: http://absolutesouthern.org - Though I've sized the image to minimize the cut off, you can still see it in the bottom. Ideally I'd like that text to be centered in the center of the box. If I'm missing something obvious, I apologoize.

Thanks