Logo height and width

Hi there. I’d like to have my logo display larger. I’ve had a bit of a hunt through the forum and tried adding the code suggested here https://hb-themes.com/forum/all/topic/css-overwrite-needed-for-highend-header-padding/ but nothing has changed.

Can you take a look and make a suggestion?

My site is http://www.ruwinning.com

Thanks.