Changing the scrollbar properties are not part of the W3C standard, but some browsers support them.
Use the following CSS settings:
Scrollbar-face-color
Scrollbar-shadow-color
Scrollbar-highlight-color
Scrollbar-3dlight-color
Scrollbar-darkshadow-color
Scrollbar-track-color
Scrollbar-arrow-color
You can use these settings for the main window scrollbar, textareas, framesets, iframes and any object that uses a scrollbar.
Place these CSS settings in either the body or html css tags.
How to colour your web page scrollbars