Logo Size

Hello,

I’ve been wrestling with a small issue for weeks and can’t figure it out. All I’d like to do is resize my logo on my site. I don’t know the first thing about coding or CSS, so can anybody tell me how to edit it? Here is my css file.

http://heatchecks.com/wp-content/themes/megazine/css/theme.min.css

I know exactly what I need to add as well because I played around with Firebug, I just don’t know how to actually do it. This has been very annoying, and my theme does not have “theme options” available, so I’ve had to go through all this instead. My theme owner was no help, I need someone to dumb this down for me. I’m a writer, not a coder!

PLEASE help. Thank you!