[Natch]

Originally Posted by KirbyDE

Not possible if you want compliant CSS, as there is no attribute for specifying scrollbar color.

If you don't care: Set scrollbar-base-color, scrollbar-3dlight-color, scrollbar-arrow-color, scrollbar-darkshadow-color, scrollbar-face-color, scrollbar-highlight-color, scrollbar-shadow-color and scrollbar-track-color for the BODY-Tag.

You can still have compliant CSS Do it with Javascript

NOTE: this is script I wrote by hand - feel free to use it but PLEASE leave the acknowledgement in ... it *should* retain colours that fit with your style automatically but of course will only render colours in IE

<script type="text/javascript">
<!-- 
/* START I.E. only Flat ScrollBar Colour Script for use with CSS2 Validation */
/* coded by Natch - mobileforces.org */
bg  = window.document.bgColor;
txt = window.document.fgColor;
if (document.all){
 with (window.document.body.style){
 scrollbarBaseColor=bg;
 scrollbarFaceColor=bg;
 scrollbarHighlightColor=txt;
 scrollbar3dLightColor=bg;
 scrollbarShadowColor=txt;
 scrollbarDarkShadowColor=bg;
 scrollbarArrowColor=txt;
 scrollbarTrackColor=txt;
 }
}
/* END I.E. only Flat ScrollBar Colour Script for use with CSS2 Validation */
//-->
</script>

(NB: your CSS won't be compliant, but doing it via Javascript will hide your non-compliant CSS from the validator )