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Custom CSS codes in the Notification/Autoresponder email is possible, but we advise to place it inside the table tags, use the same formatting. Example, add the Custom CSS into the following existing lines:
Using ID/Classes/Names into the settings is NOT possible because the Source Editor will place the codes inside the pharagraphs tags. Example, when you save the custom CSS, this the result:
If you have any further questions, let us know and we will be happy to help.
I will rewrite the code, I suppose.
You can see more about that here: http://www.w3schools.com/html/html_css.asp (just scroll a bit down to Inline Styling (Inline CSS) section.
You could also copy the HTML code from within the email autoresponder and use their try it now option if you not too familiar with the CSS.
Inline CSS Try It Now option from w3Schools.com