<table class="reportTable">
     <thread>
          <tr>
                <th>firstColumn</th>
                <th>secondColumn</th>
                <th>thirdColumn</th>
          </tr>
     </thread>
     <tbody>
          <tr>
               <td>1</td>
               <td>2</td>
               <td>3</td>
          </tr>
          <tr>
               <td>11</td>
               <td>22</td>
               <td>33</td>
          </tr>
          <tr>
               <td>111</td>
               <td>222</td>
               <td>333</td>
          </tr>
     </tbody>
</table>

.reportTable th,td{
      border-bottom: 1px solid #E7E7E7;
      border-right:16px solid transparent;

 }

.reportTable {
    border-spacing: 10px 0;
}
.reportTable th, .reportTable td {
    border-bottom: 1px solid #E7E7E7;
    border-right: 1px solid #E7E7E7;
}