I had written a code to make table header fixed. And make vertical scroll bar, header and table data size and table width should be fixed. I even declared table-responsive for adjusting automatic width for the th and td.
How can I make vertical scroll with th fixed and table data size fixed?
thead th {
  height: 30px;
}
tbody {
  overflow-y: auto;
  height: 190px;
}<link href="http://netdna.bootstrapcdn.com/bootstrap/3.1.0/css/bootstrap.min.css" rel="stylesheet">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>
<script src="http://netdna.bootstrapcdn.com/bootstrap/3.1.0/js/bootstrap.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
<script src="http://netdna.bootstrapcdn.com/bootstrap/3.1.0/js/bootstrap.min.js"></script>
<div class="container">
  <table class="table  table-bordered table-responsive">
    <thead>
      <tr>
        <th>Sl No</th>
        <th>Full Name</th>
        <th>Email</th>
        <th>Designation</th>
        <th>Department</th>
      </tr>
    </thead>
    <tbody>
      <tr>
        <td>1</td>
        <td>Unkown User</td>
        <td>unknown@gmail.com.com</td>
        <td>Unkown User</td>
        <td>Unkown User</td>
      </tr>
      <tr>
        <td>1</td>
        <td>Unkown User Unkown User </td>
        <td>unknown@gmail.com.com</td>
        <td>Unkown User</td>
        <td>Unkown User</td>
      </tr>
      <tr>
        <td>1</td>
        <td>Unkown User</td>
        <td>unknown@gmail.com.com</td>
        <td>Unkown User</td>
        <td>Unkown User</td>
      </tr>
      <tr>
        <td>1</td>
        <td>Unkown User</td>
        <td>unknown@gmail.com.com</td>
        <td>Unkown User</td>
        <td>Unkown User</td>
      </tr>
      <tr>
        <td>1</td>
        <td>Unkown User</td>
        <td>unknown@gmail.com.com</td>
        <td>Unkown User</td>
        <td>Unkown User</td>
      </tr>
      <tr>
        <td>1</td>
        <td>Unkown User</td>
        <td>unknown@gmail.com.com</td>
        <td>Unkown User</td>
        <td>Unkown User</td>
      </tr>
    </tbody>
  </table>
</div> 
     
     
    