Background image on some, not all pages

Dear Mahesh, I haven’t found anything about this in forum, so here’s another question: is it possible, to use a background image on some pages (not posts), for example komma-duesseldorf.de/team/ page-id-52? And, if it’s so, does the image must have specific size, e. g. 600 x600 px, or is it possible to use 500x200 px and repeating the image? Thanks a lot! Regards, ElkeHB