How to give margin to a simple page not all pages

Hi, i have some knowledge about wordpress but dont seems to get it right this time, i am trying to give margin to the content of a particular page but not working.

i have tried .page-id-8 #content{margin-left:30px;} but not working.

see the page here : http://www.cityflavourmagazine.com/?page_id=8

help help will be appreciated.

regards