Hi,
yes, you could remove the "-id-2" part here, and make that piece of code apply to all tables. In this example, you don't want to do this though, as it would change the height of all cells in all tables then.
The .column-8 specifies that the code shall only apply to column 8 of the table. However, as in the responsive mode the table is flipped, this basically targets row 8 of the table when in responsive mode.
Regards,
Tobias