代码如下：
<divclass="inner">
<divclass="innerbox">
<pstyle="height:200px;">这是内容111</p>
<pstyle="height:400px;">这里是内容222</p>
<p>这里是内容333</p>
</div>
</div>
.inner{
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:"5FAE8F6F96C59ED1",Helvetica,"黑体",Arial,Tahoma;
height:100%;
}/*滚动条样式*/
.innerbox::-webkit-scrollbar{/*滚动条整体样式*/
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:inset005pxrgba(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:inset005pxrgba(0,0,0,0.2);
border-radius:0;
background:rgba(0,0,0,0.1);
}