css修改滚动条默认样式

html:

<div class="inner">
    <div class="innerbox">
        <p style="height:200px;">这是内容111</p>
        <p style="height:400px;">这里是内容222</p>
        <p>这里是内容333</p>
    </div>
</div>

css:

.inner{
      width: 265px;
      height: 400px;
      position: absolute;
      top: 33px;
      left: 13px;
      /*cursor: pointer;*/
      overflow:hidden;
}
.innerbox{
      overflow-x: hidden;
      overflow-y: auto;
      color: #000;
      font-size: .7rem;
      font-family: "\5FAE\8F6F\96C5\9ED1",Helvetica,"黑体",Arial,Tahoma;
      height: 100%;
}        
/*滚动条样式*/
.innerbox::-webkit-scrollbar {/*滚动条整体样式*/
     width: 4px;     /*高宽分别对应横竖滚动条的尺寸*/
     height: 4px;
}
.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);
}        

更具体的可以参考:https://www.lyblog.net/detail/314.html