Html Navigation Dropdown Build

Hi, I would like my website to please have a html top navigation built. In this initial build I would like the top 'sticky strip' ( here: https://www.honed.co/ ) to please upon click drop down to reveal six tags that are centred and side by side, similar to what you see styling wise in the 'side projects' area of the site ( https://www.honed.co/#projects ), but in-line with the size of the sticky banner. So smaller and neater in buttons, borders, and text. Other build aspects:

- I would like the same styling you see on buttons across the site - in terms of mouseover colours, but the weighting of lined borders needs to look right if slimmed down
- I'd like the down chevron for 'See Matts side projects' to be an 'x' when the menu is opened, and for the ability to click any aspect of the 'see Matt's side projects' for it to collapse or reveal
- It should be a solid white background
- It must work on mobile
- It must be built in a way that easily allows for me to to merely drop the html code into the page(s)