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Any idea to make this type of nav to work?

I’ve kinda made how I want it to look like, but it’s not really working well…
Plus it’s really horrible on mobile view.
Here’s a video of current navigation:

Here’s the page example that I want to follow:
I want to use dropdown element so it functions well when its on mobile mode. However, I couldn’t figure out…

Please help!

Here is my public share link: LINK
(how to access public share link)