解决Layui表格表头固定与内容滚动分离的方案

<html>
 <head></head>
 <body>
 <div id="righttable" style="width:100%;height:70%;padding-bottom: 2px;position:relative;"> 
  <table class="layui-table" border="1" style="width: 100%;border:1px solid #ddd;"> 
  <thead id="thead_"> 
   <tr>
   <th>站点名称</th>
   <th>站点排名</th>
   <th>站点电量(kWh)</th>
   </tr> 
  </thead> 
  </table> 
  <div style="position:absolute;bottom:2px;top:31px;overflow-y:scroll;width:100%"> 
  <table class="layui-table" border="1" style="width: 100%;border:1px solid #ddd;"> 
   <tbody id="tbody_"> 
   </tbody> 
  </table> 
  </div> 
 </div>
 </body>
</html>

.layui-table tr th,td{white-space:nowrap;padding:5px;text-align:center;width:33.4%;}