Blank area before tables

When I enable the DataTables JavaScript library with a table,
the table ends up way down in the post itself, like you have to scroll one page of empty space.
I added this custom css as I found in a similiar case:

.dataTables_wrapper,
.dataTables_wrapper .tablepress {
  clear: none !important;
}

That move up the search box, but the tables are still down there.

Please advise.