How do I add the open state on the hamburger icon?
Depending on how much you want to customise you have two main options.
First you can edit the styles of the open state. Here is some info on that: Navbar menu button | Webflow University
Or if you want more customisation you can remove the default icon and create your own. Here is some info on that from our blog (note: this is using some of our older UI and interactions, but the concepts are the same): How to customize your hamburger menu in Webflow | Webflow Blog
Hope that points you in the right direction.
Got it all figured out.