Giving custom classes to each TD for styling – Datatables & jQuery

You can use sClass parameter in Columns definition. For example, if you have 3 columns and want to pass custom class for second and third column, you can:

"aoColumns": [
    null,
    { "sWidth": "95px", "sClass": "datatables_action" },
    { "sWidth": "45px", "sClass": "datatables_action" }
]

You can check datatables documentation