css3修改滚动条样式

/*滚动条整体样式*/
/*高宽分别对应横竖滚动条的尺寸*/
.content-box::-webkit-scrollbar{
     4px;     
    height: 4px;
}
/*滚动条里面小方块*/
.content-box::-webkit-scrollbar-thumb{
    border-radius: 5px;
    -webkit-box-shadow: inset 0 0 5px rgba(0,0,0,0.2);
    background: rgba(0,0,0,0.2);
}
/*滚动条里面轨道*/
.content-box::-webkit-scrollbar-track{
    -webkit-box-shadow: inset 0 0 5px rgba(0,0,0,0.2);
    border-radius: 0;
    background: rgba(0,0,0,0.1);
}