table <thead>表格css‘样式

<table  class="table table-bordered table-hover" id="">
 <thead>
 <th>操作</th>
 </thead>
 <tbody>
 <tr>
　　<td></td>
 </tr>
</tbody>
</table>
                                                                   

    <style type="text/css">
            table th {
                white-space: nowrap;
            }

            table td {
                white-space: nowrap;
            }

            table {
                empty-cells: show;
                border-collapse: collapse;
                margin: 0 auto;
            }
    .table-bordered{
                         border: 1px solid #ddd;
                         border-collapse: separate;
                          border-left:;

                          }
         .table-hover tr:hover {background:#eee}
        </style>