Dropdown menu on pagescroll site

Trying to wrap my head around adding a dropdown menu to a page scroll site using the Grayscale theme. I understand they need to be children to the parent and be visible (01.) but I think my issue is with my navigation.html.yaml page coding ( http://pastebin.com/50U58xcx ).

using the grayscale theme if that helps and I’ve enabled dropdown in the grayscale.yaml.

The theme seems not originally thought to work with a dropdown menu, the original navigation.html.twig does not include it https://github.com/vmcosta/grav-theme-grayscale/blob/master/templates/partials/navigation.html.twig, so first check that it works in Antimatter or in another theme that supports it, then you can copy how they did it.