bootstrap 內邊框樣式

css設置：

.table>tbody>tr>td, 
.table>tbody>tr>th, 
.table>tfoot>tr>td, 
.table>tfoot>tr>th, 
.table>thead>tr>td, 
.table>thead>tr>th {
    padding: 8px;
    line-height: 1.42857143;
    vertical-align: top;
    border-top: 2px solid #f7f7f7; /*邊框顏色*/
}