html如何给table加边框（HTML table 表格边框的实现思路）

 // CSS
    table { background:#DCDFE6; width: 100%; }
    table td { background:#FFFFF; }
    // HTML
    <table border="0" cellspacing="1" cellpadding="0">
         <tr>
           <td colspan="3"><el-checkbox>仪表面板</el-checkbox></td>
         </tr>
         <tr>
            <td rowspan="2"><el-checkbox>渠道管理</el-checkbox></td>
            <td><el-checkbox>渠道列表</el-checkbox></td>
           <td>
              <el-checkbox>新增</el-checkbox>
              <el-checkbox>编辑</el-checkbox>
              <el-checkbox>删除</el-checkbox>
           </td>
        </tr>
   </table>