Great to see another CSS > JavaScript enthousiast.

To do these things I use Tailwind which makes it easier for me to change and see what is happening. You can do so many things with just CSS. Dropdowns, animated sidebar menus, toggled areas, file-upload areas with resets to previous version or removing an upload, modals with and without backdrops, etc, etc.

I hardly use any JavaScript anymore and it is great.