message: Fix separator widget CSS
diff: @@ -100,7 +100,7 @@ class GridLayout extends React.Component {
  id={'slice_' + slice.slice_id}
  key={slice.slice_id}
  data-slice-id={slice.slice_id}
  - className="widget"
  + className={`widget ${slice.form_data.viz_type}`}
  >
  <SliceCell
  slice={slice}
  