一、效果图

    

二、css    

::-webkit-srollbar-track-piece{background:none;-webkit-border-radius:0;}
::-webkit-scrollbar{width:8px;height:8px;}
::-webkit-scrollbar-thumb:vertical{height:50px;background-color:#bbbbbb;-webkit-border-radius:4px;outline:0px solid #ffffff;ouline-offset:-2px;border:2px solid #ffffff;}
::-webkit-scrollbar-thumb:hover{height:50px;background-color:#999999;-webkit-border-radius:4px;}
::-webkit-scrollbar-thumb:horizontal{width:50px;background-color:#bbbbbb;-webkit-border-radius:4px;outline:0px solid #ffffff;ouline-offset:-2px;border:2px solid #ffffff;}