SCROLLBAR-HIGHLIGHT-COLOR: #000000; 滚动条左，上边缘的色彩
SCROLLBAR-SHADOW-COLOR: #000000; 滚动条右，下边缘的色彩
SCROLLBAR-3DLIGHT-COLOR: #ffffff; 滚动条左，上边缘的3D色彩
SCROLLBAR-ARROW-COLOR: #000000; 两端的小三角形的色彩
SCROLLBAR-TRACK-COLOR: #EAEAEA; 滚动范围内的背景色彩
SCROLLBAR-DARKSHADOW-COLOR:#EAEAEA; 滚动条右，下边缘的3D色彩
http://iconico.com/CSSScrollbar/