Datatables with fixedHeader

HTML

<script src="https://code.jquery.com/jquery-1.12.3.js"></script>
<script src="https://cdn.datatables.net/1.10.12/js/jquery.dataTables.min.js"></script>
<script src="https://cdn.datatables.net/fixedheader/3.1.2/js/dataTables.fixedHeader.min.js"></script>
<link rel="stylesheet" href="https://cdn.datatables.net/1.10.12/css/jquery.dataTables.min.css">
<link rel="stylesheet" href="https://cdn.datatables.net/fixedheader/3.1.2/css/fixedHeader.dataTables.min.css">
<table id="example" class="display" cellspacing="0" width="100%">
    <thead>
        <tr>
            <th>Name</th>
            <th>Position</th>
            <th>Office</th>
            <th>Age</th>
            <th>Start date</th>
            <th>Salary</th>
        </tr>
    </thead>
    <tfoot>
        <tr>
            <th>Name</th>
            <th>Position</th>
            <th>Office</th>
            <th>Age</th>
            <th>Start date</th>
            <th>Salary</th>
        </tr>
    </tfoot>
    <tbody>
        <tr>
            <td>Tiger Nixon</td>
            <td>System Architect</td>
            <td>Edinburgh</td>
            <td>61</td>
            <td>2011/04/25</td>
            <td>$320,800</td>
        </tr>
        <tr>
            <td>Garrett Winters</td>
            <td>Accountant</td>
            <td>Tokyo</td>
            <td>63</td>
            <td>2011/07/25</td>
            <td>$170,750</td>
        </tr>
        <tr>
            <td>Ashton Cox</td>
            <td>Junior Technical Author</td>
            <td>San Francisco</td>
            <td>66</td>
            <td>2009/01/12</td>
            <td>$86,000</td>
        </tr>
        <tr>
            <td>Cedric Kelly</td>
            <td>Senior Javascript Developer</td>
            <td>Edinburgh</td>
            <td>22</td>
            <td>2012/03/29</td>
            <td>$433,060</td>
        </tr>
        <tr>
            <td>Airi Satou</td>
            <td>Accountant</td>
            <td>Tokyo</td>
            <td>33</td>
           ...

JavaScript

$(document).ready(function() {
    $('#example').DataTable({
        'fixedHeader': true,
        //'autoWidth': false,
        'columns': [{
            'orderable': false,
            'width': '130px'
        }, {
            'orderable': false
        }, {
            'orderable': false,
            'width': '70px'
        }, {
            'orderable': false,
            'width': '30px'
        }, {
            'orderable': false,
            'width': '60px'
        }, {
            'orderable': false,
            'width': '70px'
        }, ]
    });
});