修改webkit内核浏览器滚动条

::-webkit-scrollbar{
    width: 30px;
height: 30px;
}
::-webkit-scrollbar-thumb{
    border-radius:9999px;
background:linear-gradient(#3D4450,#6b778c) repeat scroll 0 0 #3D4450;
}
::-webkit-scrollbar-track-piece{
    border-right:1px solid #EEE;
    border-left:1px solid #e4e4e4;
    background-color:#f0f0f0;
    background-image:-webkit-linear-gradient(left,#f0f0f0,#FFF);
}