table.dataTable tr.odd not working for 1st column

Hi,

I am trying to change the color of rows in datatable using the below CSS.

table.dataTable tr.odd { background-color: #E2E4FF; }
table.dataTable tr.even { background-color: white; }

This change doesnt seem to affect first column in datatables, I can see the new color in other columns.

Can someone please let me know the reason for this issue?

Thanks
Barani