Hi,
if you talk about short text, than it is rather easy.
And of course you can use multiple, doing the "mandatory or not" stuff in the question validation.
But if you have other types of question it will be less easy.
But with the right question type (single arranched in columns, arrays with drop-downs) this will be covered, too.
To decide if there is some css necessary, you should - as always recommended - send a small example of your survey.
Joffm