Header height in mobile

Hi,
I know how to set the logo size using the max-height css parameter, but how can I make black space above/below the logo smaller? I would also like to make the mobile menu icon a bit smaller.

Please have a look at the mobile version of this page: http://www.genco.tv/wiseguys-wackjobs/

Just make the browser window small for it to kick in.

Thanks,
Chris