Menu container issue

Hi

I wonder if I could get some help please…
I’m following PixelGeek’s video here to create a mega menu but run into an issue. Please see my short video here.

Here’s PixelGeek’s video (go to 6mins 25 secs) Simple Mega Menu in Webflow - Tutorial (2021) - YouTube

Share link here: https://preview.webflow.com/preview/semh?utm_medium=preview_link&utm_source=designer&utm_content=semh&preview=40abbf0ec7016c9018e7676b025fdd2d&workflow=preview

Many thanks for any help.

Graham

Here is my site Read-Only: LINK
(how to share your site Read-Only link)