Removing footer on one page only

Hi ,

I have been going round in circles with this.. I want to remover the footer on one specific page only. The page has has a name in the permalink (send-flowers) but the post id is 558 so I have edited the ccs to include this :-

body.page-id-558 #td footer {
display: none;
}

But the footer refused to die , what have I done wrong please ?

I am still using 3.4.4 and wordpress 3.21

Cheers