InheritanceStaff

I'm using Bedford template. I find I cannot adjust the amount of space that my banner image takes up on the screen. Naturally I want it to stretch width-wise, but vertically it takes up the entire screen on my Mac, and only ¼ on PC browsers. Is there a way to standardize this? Also, just in general a way to drag to banner area up and down to dictate the spread of the image? Thanks in advance.