different background color for one specific page

Hello I need to change the background color of one specific page. On that page there is now one image and under the image there is a white space.And I do not get rid of it. I tried to change the background image. I found numerous solutions, but all fail. One of the solutions of which I think it must work is on the catch forum: .page-id-1859 #main { background-color: #f7f7f7; } Also this css did not make the trick. Is there a solution for this problem? Kind regards Hans Hagmeijer