Need Larger Logo setup for Discover Theme

It is not just the Discover theme that seems to make custom logos one size (usually 225px), but I ether need to fix the theme so My 450 px logo will fit along the top of the page or find a similar theme that allows for it. I really like the Discover theme and so does my client, If I can fix the logo problem he wants to purchase the premium version to allow my slides in the slideshow.