How to add a class for ninja form field_table?

I use ninja forms for a registration of an event. In the success message and in the confirmation mail, I want to show all the data entered by the users.

Ninja form has an filter called {fields_table}. But, I dont know how to style this using css or in other words, can I add a css class for this filter? If yes, how to do that?

There is a filter named ninja_forms_action_email_message that you could use to manipulate the email message body.

I never tried, in the end I preferred to avoid using {fields_table} as a whole and manually created the HTML + styling in the form settings by specifying each single field manually.