Changing form orientation from vertical to horizontal?

Is this something that can be done in Marketo without having to edit CSS or is it a developer only type of deal? 
We're attempting to change all of forms on our Website (previously gravity forms) to Marketo forms and we'd like to follow the same sort of layout we had before in which our form displayed horizontally instead of MK's vertical display...


Can I do this myself or will I have to call on my web developer?