Thanks Robert. I have followed the above but for some reason the menu does not work as expected.
For step one I replaced header code in sweetdate/header.php
For step 2 I added that css in sweetdate/assets/styles/app.css
For step 3 I added the code to sweetdate-child/functions.php
In the WP admin I have the sticky theme enabled? Is this correct. if it is disabled no menu shows at all.
When the page first loads the sticky menu seems correct but two problems occur.
As I start to scroll the sticky nav disappears and then reappears (flashes).
Also when I then scroll back up to the top of the page the sticky navigation disappears and the other menu appears (like the original design).
Also where would be the best place to remove the ‘top-links’ row.
Thanks for your help.