Add css to show Active kanban item when the item is clicked

Does anyone know of a way to add a css class to the selected kanban item. We slide out a panel and show the details of the selected item and with several lanes and such, it is easy to lose track of which one you clicked on. I’d like to add a border or something and can’t figure it out. Inspecting it at runtime shows that there is no class added to use. I thought I’d try adding it in the click event, but I don’t have the knowledge to do so and have failed to figure out how to get the selected item and how to add the class. It doesn’t look like there is a way to me, so I thought I’d ask.