Increasing Logo Size in Header

Hi,

Perhaps something is not loading properly as there are no other threads posted about this issue but after uploading my logo under onetone options -> Logo, the logo appears far too small on the front end. I want to fill the left side of the header with the logo but keep the header height the same. So annoying as it seems like such a simple task yet after fiddling around with retina width/height settings etc I am still stumped!

Site not live yet so can’t link URL.

Thanks in advance.