Well, you could edit the "body" class in the style and set it as:
margin; 0px;
padding: 0px;
well.. you wouldn't do "margin-top
; 0px; because that is incorrect css syntax and wouldn't work..
margin-top: 0px; at least is syntactically correct..
as a general rule, i set the body margins and padding to all 0;
margin:0;
padding:0;
is the most concise ... px isn't needed for a 0 value