.table-fixed{
  width: 100%;
  background-color: #f3f3f3;
  tbody{
    height:200px;
    overflow-y:auto;
    width: 100%;
    }
  thead,tbody,tr,td,th{
    display:block;
  }
  tbody{
    td{
      float:left;
    }
  }
  thead {
    tr{
      th{
        float:left;
       background-color: #f39c12;
       border-color:#e67e22;
      }
    }
  }
}

<div class="container">
  <table class="table table-fixed">
    <thead>
      <tr>
        <th class="col-xs-3">First Name</th>
        <th class="col-xs-3">Last Name</th>
        <th class="col-xs-6">E-mail</th>
      </tr>
    </thead>
    <tbody>
      <tr>
        <td class="col-xs-3">John</td>
        <td class="col-xs-3">Doe</td>
        <td class="col-xs-6">johndoe@email.com</td>
      </tr>

      <tr>
        <td class="col-xs-3">John</td>
        <td class="col-xs-3">Doe</td>
        <td class="col-xs-6">johndoe@email.com</td>
      </tr>
      <tr>
        <td class="col-xs-3">John</td>
        <td class="col-xs-3">Doe</td>
        <td class="col-xs-6">johndoe@email.com</td>
      </tr>
      <tr>
        <td class="col-xs-3">John</td>
        <td class="col-xs-3">Doe</td>
        <td class="col-xs-6">johndoe@email.com</td>
      </tr>
      <tr>
        <td class="col-xs-3">John</td>
        <td class="col-xs-3">Doe</td>
        <td class="col-xs-6">johndoe@email.com</td>
      </tr>
      <tr>
        <td class="col-xs-3">John</td>
        <td class="col-xs-3">Doe</td>
        <td class="col-xs-6">johndoe@email.com</td>
      </tr>
      <tr>
        <td class="col-xs-3">John</td>
        <td class="col-xs-3">Doe</td>
        <td class="col-xs-6">johndoe@email.com</td>
      </tr>
      <tr>
        <td class="col-xs-3">John</td>
        <td class="col-xs-3">Doe</td>
        <td class="col-xs-6">johndoe@email.com</td>
      </tr>
      <tr>
        <td class="col-xs-3">John</td>
        <td class="col-xs-3">Doe</td>
        <td class="col-xs-6">johndoe@email.com</td>
      </tr>
      <tr>
        <td class="col-xs-3">John</td>
        <td class="col-xs-3">Doe</td>
        <td class="col-xs-6">johndoe@email.com</td>
      </tr>
      <tr>
        <td class="col-xs-3">John</td>
        <td class="col-xs-3">Doe</td>
        <td class="col-xs-6">johndoe@email.com</td>
      </tr>
      <tr>
        <td class="col-xs-3">John</td>
        <td class="col-xs-3">Doe</td>
        <td class="col-xs-6">johndoe@email.com</td>
      </tr>
      <tr>
        <td class="col-xs-3">John</td>
        <td class="col-xs-3">Doe</td>
        <td class="col-xs-6">johndoe@email.com</td>
      </tr>
      <tr>
        <td class="col-xs-3">John</td>
        <td class="col-xs-3">Doe</td>
        <td class="col-xs-6">johndoe@email.com</td>
      </tr>
      <tr>
        <td class="col-xs-3">John</td>
        <td class="col-xs-3">Doe</td>
        <td class="col-xs-6">johndoe@email.com</td>
      </tr>
      <tr>
        <td class="col-xs-3">John</td>
        <td class="col-xs-3">Doe</td>
        <td class="col-xs-6">johndoe@email.com</td>
      </tr>
      <tr>
        <td class="col-xs-3">John</td>
        <td class="col-xs-3">Doe</td>
        <td class="col-xs-6">johndoe@email.com</td>
      </tr>
      <tr>
        <td class="col-xs-3">John</td>
        <td class="col-xs-3">Doe</td>
        <td class="col-xs-6">johndoe@email.com</td>
      </tr>
      <tr>
        <td class="col-xs-3">John</td>
        <td class="col-xs-3">Doe</td>
        <td class="col-xs-6">johndoe@email.com</td>
      </tr>
      <tr>
        <td class="col-xs-3">John</td>
        <td class="col-xs-3">Doe</td>
        <td class="col-xs-6">johndoe@email.com</td>
      </tr>
    </tbody>
  </table>
</div>

<div style="overflow-y:auto; max-height: 100px">
        <table id="table" class="table table-condensed table-hover globalVariablesTable table-striped">

            <tr>
                <th><strong>Variable Names</strong></th>
                <th><strong>Values</strong></th>
                <th><strong>Actions</strong></th>
            </tr>
            <tbody>
                <tr>
                    <td><strong>Variable Names</strong></td>
                    <td><strong>Values</strong></td>
                    <td><strong>Actions</strong></td>
                </tr>
            </tbody>
        </table>
    </div>