Can css do this? [navagation]

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hope everyone is well! I am trying to replicate this navigation:

http://www.3-form.com

The difference being 3Form used javascript, and I would prefer to use CSS.

I have made an attempt here:

http://www.brianfitzgeralddesign.com/pop_up.html

but, as you can see, I can’t figure out how to make the “Pop-up” links flow where neatly below the main navigation, as 3Form accomplished. Can this be done with CSS? If so, how?

Thanks!
Fitz