[Plugin: Dynamic Headers] Centering the Header

I’m having a lot of difficulty centering the header on my pages. From the forum, I understand that the header images can’t be centered because the image doesn’t get any style formatting, and that I have to change this in my style sheet. However, that comment was from over a year ago, so maybe this plug-in has been updated to accommodate centering.

Does anybody have any insight on how to center the header image?

I’m currently using “Arras” theme if that helps.

Thanks!