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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: https://preview.webflow.com/preview/cursed?utm_medium=preview_link&utm_source=designer&utm_content=cursed&preview=a1af58f6cf997b04fd867388eededba6&mode=preview
(how to share your site Read-Only link)

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