For example the first thing I am trying to change is the background and font colours on the "Back >" menu item, which uses this foundation css when I look it up in my browser's developer tools:
.drilldown a {
padding: 0.7rem 1rem;
background: #fefefe;
}
padding: 0.7rem 1rem;
background: #fefefe;
}
https://foundation.zurb.com/sites/docs/drilldown-menu.html
As the element doesn't appear in Site Designer itself, I suppose I'll just have to style it after export, but I figure worth seeing if anyone else has come across this!
Cheers

J