@PD4ML wrote:

PD4ML does not support

tag. It simply ignores it.

So TBODY.ui-datatable-data condition makes the selector to fail.
As a workaround I would recommend to remove .ui-datatable-data from there.

[language=css:17o7cf6v].ui-datatable td, .ui-datatable .ui-datatable-data-empty td{
padding: 4px 10px;

Here is the issue. Ok, I’m now able to correct it. Thanks a lot for your help.
Moreover, we use the 3.5.1 professional version. If we want update to the 3.7.0 one, do we have to pay it?