{% if 'fluid' in prefix %}
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.