dataTables_empty css has no effect to the table

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Hi,

For some reasons it has no effect to the "No matching records found" message even I modified the demo_table.css:

.dataTables_empty {
color: red;
padding-left: 400px;
}

I found this post, but I am not sure if I edited the wrong spot.
http://datatables.net/forums/discussion/7417/customize-no-matching-records-found-message-on-tables/p1
I tried to replace my demo.css to "jquery.dataTables.css" and it doesn't do anything too.

table.dataTable td.dataTables_empty {
color: red;
text-align: right;
}

It is not like it doesn't work at all. It works if I modified the: "table.dataTable thead th", ".paging_full_numbers a.paginate_active", "table.dataTable tr.even"

Has someone experience this issue before?

Thanks.