Custom header image height

Hi, I recently bought Adonis Pro theme but I am facing some layout issues. The header on Home page covers the full screen (full height), which is ok. For individual pages, I use featured image header. So far everything works but what I am not satisfied with is the height of this custom header. I looked in the theme editor but I was not able to find how to reduce the height of the block for those custom header. Adjusting "height: 100%" to "height: 50%" in "Custom-header:before" does reduce the image by 50% of its height BUT the block itself has still the same height : 50 % with the image and the other 50% with the background color. Does anyone could help me to solve this ? Ideally I would like to change this height only for featured image header and keep it the way it is for the Home page. I guess it is possible since they already don't have the same height. (My website is not online yet...) Thanks a lot in advance.