Can't Get Dropdown Grid to Look Right

I’ll include a screenshot of what the site is supposed to look like, and then provide the read only link so you can see what I’ve got so far.

Essentially I’m practicing building sites from scratch, beginning with the Nav. I can’t seem to get this dropdown grid to look like the one I’m mimicking, even when implementing the same layout and styling. Any advice?

Here is my site Read-Only: (Webflow - Project 2: Excel Life Site)