FKB Pro - Social theme

If i wanted to add custom CSS to the theme, would i be right in thinking that the ‘settings editor’ is replacing the edit html/css button?

So where @Don’s CSS finishes:

{
	"setting": "dark_btn_hover",
	"value": "rgba(var(--primary-rgb),.1)"
}
]

I’d just carry on below like with something like this

data-category-id='offers' [
  .discourse-kanban-list {
	 width: 50%;
     }
]

(one category only has two columns in its Kanban board and i want those to be wider, 50% of the space each)