Not too far off completing this site - just trying to optimise for devices and have issues with display and sticky header re-sizing.

I've followed info on creating a header within helix using the header position rather than using the standard headers but not re-sizing well - the top bar dissapears, logos don't resize, menu "burger" doesn't stay at the top of the page etc. I can't seem to find how to adjust in settings and code. I thought of maybe re-creating the header and placing as a module but unlike other editors where you can do this there doesn't seem to be an add-on for a menu that calls items from the Joomla main menu rather you have to create manually. Be interested to hear how others have gone about creating a custom header or best practise.

Any help pointers or assistance much appreciated.