Scrollbars via stylesheet.css

[eeeek]

I am losing my mind ... have been staring at this WAY too long & hope someone can tell me what I am overlooking.

I am trying to add stylized scrollbars, and theoretically the following code in my custom CSS stylesheet.css should work:

body {
scrollbar-3dlight-color:#1C6B8A;
scrollbar-arrow-color:#FFFFFF;
scrollbar-base-color:#1C6B8A;
scrollbar-darkshadow-color:#000000;
scrollbar-face-color:#1C6B8A;
scrollbar-highlight-color:#FFFFFF;
scrollbar-shadow-color:#1C6B8A;
margin: 10;
font-family: verdana, arial, helvetica, sans-serif;
font-size: 0.7em;
color: #000000;
background-color: #005070;
padding: 10px;
}

but................................. it isn't.

I have been going through every file, the FAQs, the forum here and I cannot see what I am doing wrong.

Does anyone here have an answer before my head gets any bloodier from this wall?

Thanks in advance!

PS, before I get a bunch of people telling me that colored scrollbars suck - I know but it is what the client wants...