问题
How to change style of Scrollbar in Select Control in HTML?
回答1:
You cannot set styles to the system elements. They look different in different bowsers and OSs. And you cannot do anything dirctly with them. But you could use some jQuery plugins to replace system elements. check this
来源：https://stackoverflow.com/questions/6922807/how-to-change-style-of-scrollbar-in-select-control-on-html