How to remove sticky banner under navigation menu

I can’t find out how to remove this yellow banner under my main menu on my home page. Anybody know where to go to remove this?

Here’s the site:

Hello there,

I can confirm that it isn’t part of the Sydney’s elements. Maybe you used a plugin? Please Try to temporarily deactivate the all non-required plugins one by one to know which one it belongs to. If there is no any, inspect your child theme.