CSS修改滚动条默认样式

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