Changing header image height while keeping theme responsive

Howdy,

We’re wanting to adjust the height for the header image so it doesn’t crop our logo however the only way I have been able to do it is using some code that fixes the height, so when you go to the mobile version the header image is huge.

Any suggestions? Using Edin theme and jetpack plugin to add additional css.

The blog I need help with is ctkmedia.co.uk.