The iframe uses the style of what ever its loading so the anything you want to load will need the iframe css inside of it.

<STYLE>
BODY {SCROLLBAR-FACE-COLOR: red; SCROLLBAR-HIGHLIGHT-COLOR: white; SCROLLBAR-SHADOW-COLOR: black; SCROLLBAR-TRACK-COLOR: black; SCROLLBAR-DARKSHADOW-COLOR: black; SCROLLBAR-BASE-COLOR: black}
</STYLE>