Custom Dragula.js integration.
Just add the data attribute data-toggle="dragula"
to have drag and drop support in your container.
Add the data attribute data-dragula-containers='["#cards-left", "#cards-right"]'
to allow the user to drag an element in any of the containers and drop it in any other container in the list.
Add the data attribute data-dragula-moves="js-dragula-handle"
to allow the user to drag an element in any of the containers and drop it in any other container in the list using a handle.