Streaming live at 10am (PST)

How to make a line animation under nav bar

hey there!
I’m new to webflow so I would hope for your patience.
anyways I saw this question being asked but I couldn’t understand.
could you hopefully make a video for me to follow step by step?
if this is a big ask let me now.
Thanks to helpers in advance.

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

Can you explain more what you’re trying to do?