Table inner scroll

                              
<div id="wrap">                                
  <div class="table">
      <table>
          <colgroup>
              <col style="width: 120px;">
              <col style="width: 120px;">
              <col style="width: auto;">
          </colgroup>
          <thead>
              <tr>
                  <th scope="col">1번째</th>
                  <th scope="col">2번째</th>
                  <th scope="col">3번째</th>
              </tr>
          </thead>
      </table>
  </div>
  <div class="table overflow-y cScroll" style="max-height: 100px;">
      <table>
          <colgroup>
              <col style="width: 120px;">
              <col style="width: 120px;">
              <col style="width: auto;">
          </colgroup>
          <tbody>
              <tr>
                  <td></td>
                  <td></td>
                  <td></td>
              </tr>
              <tr>
                  <td></td>
                  <td></td>
                  <td></td>
              </tr>
              <tr>
                  <td></td>
                  <td></td>
                  <td></td>
              </tr>
              <tr>
                  <td></td>
                  <td></td>
                  <td></td>
              </tr>
              <tr>
                  <td></td>
                  <td></td>
                  <td></td>
              </tr>
              <tr>
                  <td></td>
                  <td></td>
                  <td></td>
              </tr>
          </tbody>
      </table>
  </div>
</div>

                              
.table{
    table{width: 100%;}
    th,td{height: 30px; border: 1px solid #ddd; padding: 5px; box-sizing: border-box; font-family: 'Noto Sans';}
    th{font-size: 14px; color: #333; background-color: #f5f5f5;}
}

.tScroll{display: block;}

                            
.table th, .table td {
  height: 30px;
  border: 1px solid #ddd;
  padding: 5px;
  box-sizing: border-box;
  font-family: 'Noto Sans';
}

.table th {
  font-size: 14px;
  color: #333;
  background-color: #f5f5f5;
}

.tScroll{
  display: block;
}

Result

1번째	2번째	3번째