How are you? You helped me out with a few things in the past. One of them was some CSS layout stuff for a wordpress site called "[url removed, login to view]". (This project https://www.freelancer.com/projects/php/finish-building-wordpress-menu-match/#/management/71521792 )
I have a similar task, if you are interested. But this time, it's in Opencart. Basically, it's editing a new development copy of the opencart site, to make the header and menu appear identical to the old opencart site. Especially the on the scroll change. Just the header. It's different because the old site is opencart v188.8.131.52 and the new one is opencart 2.3. The theme files are different and I've lost my edits.
This is the existing "old" correct site: [url removed, login to view]
And this is the new development site that needs the edits: [url removed, login to view]
I feel that it could take 1-2 hours, but you tell me if you need more time please.