Resize logo image

Hi,

I’d like the logo image in this theme to be a lot bigger (current max-height is set at 80 px), but even when I change that value, the image doesn’t go full size. I spent a lot of time messing with the CSS yesterday, and when I WAS able to get the image larger, the main content area would overlap it when the window was resized and the image moved to the top of the window. Is there a size constraint on one of the container divs I’m missing?

No link because I managed to revert back to the smaller image (at least it doesn’t break). Thanks.