::-webkit-scrollbar {width: 3px; height:3px;background-color:transparent; }
::-webkit-scrollbar-track {background-color:transparent;}
::-webkit-scrollbar-thumb {background-color:rgba(0, 0, 0, .298039);border-radius: 2px;}
原文：http://www.cnblogs.com/webgg/p/5337023.html