I’m new to WordPress and don’t have much experience, so please bear with me, but I really don’t know where to go from here.

I have a sticky header containing a logo, site name, navigation, and buttons linking outside the site, as shown in the screenshot with the block structure. The Group, which is the parent block, is sticky using Spectra’s “Make this block sticky” setting.

I need it to stay sticky on mobile as well, but when I open the hamburger menu on mobile, the overlay doesn’t open across the whole page. It only appears within the area of the header itself, almost as if overflow: hidden was applied.

If I add overflow: visible to the Group’s Additional CSS, nothing changes.

I don’t know where else I should set this or whether I’m missing something. Any idea what could be causing this?

Thank you so much!