SCROLLBAR-SHADOW-COLOR 是需要写在BODY{}里的。
BODY { 
scrollbar-face-color: #C5D5FC; 
scrollbar-shadow-color: #FFFFFF; 
scrollbar-highlight-color: #FFFFFF; 
scrollbar-3dlight-color: #C5D5FC; 
scrollbar-darkshadow-color: #7C9FD3; 
scrollbar-track-color: #FFFFFF; 
scrollbar-arrow-color: #4D6185; 
}