When scrollx is enabled the header doesn't scroll with the table body.
https://jsfiddle.net/gm90arph
I tried using
        fixedHeader:true
with no success.
I expected the header to scroll horizontally with the table body.
Edit: I want to use the Scroller extension so I don't have any pagination.
I found the solution after taking a break and looking at my code.
It was because of a small typo. I typed scrollx: true instead of scrollX: true
Now everything works as expected
https://jsfiddle.net/dg3kcyuf/2/
 $(document).ready(function() {
    $('#example').DataTable({
        scrollY: 300,
        scrollX: true,
        scroller: true
    });
} );
                        I tried reproduce your case, it work normally.
$(document).ready(function() {
        $('#example').DataTable({
            scrollY: 300,
            scrollX: true,
            scroller: true
        });
    } );
<script src="https://code.jquery.com/jquery-3.3.1.js"></script>
<script src="https://cdn.datatables.net/1.10.19/js/jquery.dataTables.min.js"></script>
<link rel="stylesheet" type="text/css" href="https://cdn.datatables.net/1.10.19/css/jquery.dataTables.min.css">
<div class="card">
    <div class="card-body">
        <table id="example" class="table table-striped table-bordered" style="width:100%">
            <thead>
                <tr>
                    <th>Name</th>
                    <th>Position</th>
                    <th>Office</th>
                    <th>Age</th>
                    <th>Start date</th>
                    <th>Salary</th>
                    <th>Header1</th>
                    <th>Header2</th>
                    <th>Header3</th>
                    <th>Header4</th>
                    <th>Header5</th>
                    <th>Header6</th>
                    <th>Header7</th>
                </tr>
            </thead>
            <tbody>
                <tr>
                    <td>Donna Snider</td>
                    <td>Customer Support</td>
                    <td>New York</td>
                    <td>27</td>
                    <td>2011/01/25</td>
                    <td>$112,000</td>
                    <td>New York</td>
                    <td>27</td>
                    <td>2011/01/25</td>
                    <td>$112,000</td>
                    <td>27</td>
                    <td>2011/01/25</td>
                    <td>$112,000</td>
                </tr>
                <tr>
                    <td>Donna Snider</td>
                    <td>Customer Support</td>
                    <td>New York</td>
                    <td>27</td>
                    <td>2011/01/25</td>
                    <td>$112,000</td>
                    <td>New York</td>
                    <td>27</td>
                    <td>2011/01/25</td>
                    <td>$112,000</td>
                    <td>27</td>
                    <td>2011/01/25</td>
                    <td>$112,000</td>
                </tr>
                <tr>
                    <td>Donna Snider</td>
                    <td>Customer Support</td>
                    <td>New York</td>
                    <td>27</td>
                    <td>2011/01/25</td>
                    <td>$112,000</td>
                    <td>New York</td>
                    <td>27</td>
                    <td>2011/01/25</td>
                    <td>$112,000</td>
                    <td>27</td>
                    <td>2011/01/25</td>
                    <td>$112,000</td>
                </tr>
                <tr>
                    <td>Donna Snider</td>
                    <td>Customer Support</td>
                    <td>New York</td>
                    <td>27</td>
                    <td>2011/01/25</td>
                    <td>$112,000</td>
                    <td>New York</td>
                    <td>27</td>
                    <td>2011/01/25</td>
                    <td>$112,000</td>
                    <td>27</td>
                    <td>2011/01/25</td>
                    <td>$112,000</td>
                </tr>
                <tr>
                    <td>Donna Snider</td>
                    <td>Customer Support</td>
                    <td>New York</td>
                    <td>27</td>
                    <td>2011/01/25</td>
                    <td>$112,000</td>
                    <td>New York</td>
                    <td>27</td>
                    <td>2011/01/25</td>
                    <td>$112,000</td>
                    <td>27</td>
                    <td>2011/01/25</td>
                    <td>$112,000</td>
                </tr>
                <tr>
                    <td>Donna Snider</td>
                    <td>Customer Support</td>
                    <td>New York</td>
                    <td>27</td>
                    <td>2011/01/25</td>
                    <td>$112,000</td>
                    <td>New York</td>
                    <td>27</td>
                    <td>2011/01/25</td>
                    <td>$112,000</td>
                    <td>27</td>
                    <td>2011/01/25</td>
                    <td>$112,000</td>
                </tr>
                <tr>
                    <td>Donna Snider</td>
                    <td>Customer Support</td>
                    <td>New York</td>
                    <td>27</td>
                    <td>2011/01/25</td>
                    <td>$112,000</td>
                    <td>New York</td>
                    <td>27</td>
                    <td>2011/01/25</td>
                    <td>$112,000</td>
                    <td>27</td>
                    <td>2011/01/25</td>
                    <td>$112,000</td>
                </tr>
                <tr>
                    <td>Donna Snider</td>
                    <td>Customer Support</td>
                    <td>New York</td>
                    <td>27</td>
                    <td>2011/01/25</td>
                    <td>$112,000</td>
                    <td>New York</td>
                    <td>27</td>
                    <td>2011/01/25</td>
                    <td>$112,000</td>
                    <td>27</td>
                    <td>2011/01/25</td>
                    <td>$112,000</td>
                </tr>
                <tr>
                    <td>Donna Snider</td>
                    <td>Customer Support</td>
                    <td>New York</td>
                    <td>27</td>
                    <td>2011/01/25</td>
                    <td>$112,000</td>
                    <td>New York</td>
                    <td>27</td>
                    <td>2011/01/25</td>
                    <td>$112,000</td>
                    <td>27</td>
                    <td>2011/01/25</td>
                    <td>$112,000</td>
                </tr>
                <tr>
                    <td>Donna Snider</td>
                    <td>Customer Support</td>
                    <td>New York</td>
                    <td>27</td>
                    <td>2011/01/25</td>
                    <td>$112,000</td>
                    <td>New York</td>
                    <td>27</td>
                    <td>2011/01/25</td>
                    <td>$112,000</td>
                    <td>27</td>
                    <td>2011/01/25</td>
                    <td>$112,000</td>
                </tr>
                <tr>
                    <td>Donna Snider</td>
                    <td>Customer Support</td>
                    <td>New York</td>
                    <td>27</td>
                    <td>2011/01/25</td>
                    <td>$112,000</td>
                    <td>New York</td>
                    <td>27</td>
                    <td>2011/01/25</td>
                    <td>$112,000</td>
                    <td>27</td>
                    <td>2011/01/25</td>
                    <td>$112,000</td>
                </tr>
                <tr>
                    <td>Donna Snider</td>
                    <td>Customer Support</td>
                    <td>New York</td>
                    <td>27</td>
                    <td>2011/01/25</td>
                    <td>$112,000</td>
                    <td>New York</td>
                    <td>27</td>
                    <td>2011/01/25</td>
                    <td>$112,000</td>
                    <td>27</td>
                    <td>2011/01/25</td>
                    <td>$112,000</td>
                </tr>
                <tr>
                    <td>Donna Snider</td>
                    <td>Customer Support</td>
                    <td>New York</td>
                    <td>27</td>
                    <td>2011/01/25</td>
                    <td>$112,000</td>
                    <td>New York</td>
                    <td>27</td>
                    <td>2011/01/25</td>
                    <td>$112,000</td>
                    <td>27</td>
                    <td>2011/01/25</td>
                    <td>$112,000</td>
                </tr>
                <tr>
                    <td>Donna Snider</td>
                    <td>Customer Support</td>
                    <td>New York</td>
                    <td>27</td>
                    <td>2011/01/25</td>
                    <td>$112,000</td>
                    <td>New York</td>
                    <td>27</td>
                    <td>2011/01/25</td>
                    <td>$112,000</td>
                    <td>27</td>
                    <td>2011/01/25</td>
                    <td>$112,000</td>
                </tr>
                <tr>
                    <td>Donna Snider</td>
                    <td>Customer Support</td>
                    <td>New York</td>
                    <td>27</td>
                    <td>2011/01/25</td>
                    <td>$112,000</td>
                    <td>New York</td>
                    <td>27</td>
                    <td>2011/01/25</td>
                    <td>$112,000</td>
                    <td>27</td>
                    <td>2011/01/25</td>
                    <td>$112,000</td>
                </tr>
                <tr>
                    <td>Donna Snider</td>
                    <td>Customer Support</td>
                    <td>New York</td>
                    <td>27</td>
                    <td>2011/01/25</td>
                    <td>$112,000</td>
                    <td>New York</td>
                    <td>27</td>
                    <td>2011/01/25</td>
                    <td>$112,000</td>
                    <td>27</td>
                    <td>2011/01/25</td>
                    <td>$112,000</td>
                </tr>
                <tr>
                    <td>Donna Snider</td>
                    <td>Customer Support</td>
                    <td>New York</td>
                    <td>27</td>
                    <td>2011/01/25</td>
                    <td>$112,000</td>
                    <td>New York</td>
                    <td>27</td>
                    <td>2011/01/25</td>
                    <td>$112,000</td>
                    <td>27</td>
                    <td>2011/01/25</td>
                    <td>$112,000</td>
                </tr>
                <tr>
                    <td>Donna Snider</td>
                    <td>Customer Support</td>
                    <td>New York</td>
                    <td>27</td>
                    <td>2011/01/25</td>
                    <td>$112,000</td>
                    <td>New York</td>
                    <td>27</td>
                    <td>2011/01/25</td>
                    <td>$112,000</td>
                    <td>27</td>
                    <td>2011/01/25</td>
                    <td>$112,000</td>
                </tr>
                <tr>
                    <td>Donna Snider</td>
                    <td>Customer Support</td>
                    <td>New York</td>
                    <td>27</td>
                    <td>2011/01/25</td>
                    <td>$112,000</td>
                    <td>New York</td>
                    <td>27</td>
                    <td>2011/01/25</td>
                    <td>$112,000</td>
                    <td>27</td>
                    <td>2011/01/25</td>
                    <td>$112,000</td>
                </tr>
                <tr>
                    <td>Donna Snider</td>
                    <td>Customer Support</td>
                    <td>New York</td>
                    <td>27</td>
                    <td>2011/01/25</td>
                    <td>$112,000</td>
                    <td>New York</td>
                    <td>27</td>
                    <td>2011/01/25</td>
                    <td>$112,000</td>
                    <td>27</td>
                    <td>2011/01/25</td>
                    <td>$112,000</td>
                </tr>
                <tr>
                    <td>Donna Snider</td>
                    <td>Customer Support</td>
                    <td>New York</td>
                    <td>27</td>
                    <td>2011/01/25</td>
                    <td>$112,000</td>
                    <td>New York</td>
                    <td>27</td>
                    <td>2011/01/25</td>
                    <td>$112,000</td>
                    <td>27</td>
                    <td>2011/01/25</td>
                    <td>$112,000</td>
                </tr>
                <tr>
                    <td>Donna Snider</td>
                    <td>Customer Support</td>
                    <td>New York</td>
                    <td>27</td>
                    <td>2011/01/25</td>
                    <td>$112,000</td>
                    <td>New York</td>
                    <td>27</td>
                    <td>2011/01/25</td>
                    <td>$112,000</td>
                    <td>27</td>
                    <td>2011/01/25</td>
                    <td>$112,000</td>
                </tr>
                <tr>
                    <td>Donna Snider</td>
                    <td>Customer Support</td>
                    <td>New York</td>
                    <td>27</td>
                    <td>2011/01/25</td>
                    <td>$112,000</td>
                    <td>New York</td>
                    <td>27</td>
                    <td>2011/01/25</td>
                    <td>$112,000</td>
                    <td>27</td>
                    <td>2011/01/25</td>
                    <td>$112,000</td>
                </tr>
                <tr>
                    <td>Donna Snider</td>
                    <td>Customer Support</td>
                    <td>New York</td>
                    <td>27</td>
                    <td>2011/01/25</td>
                    <td>$112,000</td>
                    <td>New York</td>
                    <td>27</td>
                    <td>2011/01/25</td>
                    <td>$112,000</td>
                    <td>27</td>
                    <td>2011/01/25</td>
                    <td>$112,000</td>
                </tr>
                <tr>
                    <td>Donna Snider</td>
                    <td>Customer Support</td>
                    <td>New York</td>
                    <td>27</td>
                    <td>2011/01/25</td>
                    <td>$112,000</td>
                    <td>New York</td>
                    <td>27</td>
                    <td>2011/01/25</td>
                    <td>$112,000</td>
                    <td>27</td>
                    <td>2011/01/25</td>
                    <td>$112,000</td>
                </tr>
                <tr>
                    <td>Donna Snider</td>
                    <td>Customer Support</td>
                    <td>New York</td>
                    <td>27</td>
                    <td>2011/01/25</td>
                    <td>$112,000</td>
                    <td>New York</td>
                    <td>27</td>
                    <td>2011/01/25</td>
                    <td>$112,000</td>
                    <td>27</td>
                    <td>2011/01/25</td>
                    <td>$112,000</td>
                </tr>
                <tr>
                    <td>Donna Snider</td>
                    <td>Customer Support</td>
                    <td>New York</td>
                    <td>27</td>
                    <td>2011/01/25</td>
                    <td>$112,000</td>
                    <td>New York</td>
                    <td>27</td>
                    <td>2011/01/25</td>
                    <td>$112,000</td>
                    <td>27</td>
                    <td>2011/01/25</td>
                    <td>$112,000</td>
                </tr>
                <tr>
                    <td>Donna Snider</td>
                    <td>Customer Support</td>
                    <td>New York</td>
                    <td>27</td>
                    <td>2011/01/25</td>
                    <td>$112,000</td>
                    <td>New York</td>
                    <td>27</td>
                    <td>2011/01/25</td>
                    <td>$112,000</td>
                    <td>27</td>
                    <td>2011/01/25</td>
                    <td>$112,000</td>
                </tr>
                <tr>
                    <td>Donna Snider</td>
                    <td>Customer Support</td>
                    <td>New York</td>
                    <td>27</td>
                    <td>2011/01/25</td>
                    <td>$112,000</td>
                    <td>New York</td>
                    <td>27</td>
                    <td>2011/01/25</td>
                    <td>$112,000</td>
                    <td>27</td>
                    <td>2011/01/25</td>
                    <td>$112,000</td>
                </tr>
                <tr>
                    <td>Donna Snider</td>
                    <td>Customer Support</td>
                    <td>New York</td>
                    <td>27</td>
                    <td>2011/01/25</td>
                    <td>$112,000</td>
                    <td>New York</td>
                    <td>27</td>
                    <td>2011/01/25</td>
                    <td>$112,000</td>
                    <td>27</td>
                    <td>2011/01/25</td>
                    <td>$112,000</td>
                </tr>
                <tr>
                    <td>Donna Snider</td>
                    <td>Customer Support</td>
                    <td>New York</td>
                    <td>27</td>
                    <td>2011/01/25</td>
                    <td>$112,000</td>
                    <td>New York</td>
                    <td>27</td>
                    <td>2011/01/25</td>
                    <td>$112,000</td>
                    <td>27</td>
                    <td>2011/01/25</td>
                    <td>$112,000</td>
                </tr>
                <tr>
                    <td>Donna Snider</td>
                    <td>Customer Support</td>
                    <td>New York</td>
                    <td>27</td>
                    <td>2011/01/25</td>
                    <td>$112,000</td>
                    <td>New York</td>
                    <td>27</td>
                    <td>2011/01/25</td>
                    <td>$112,000</td>
                    <td>27</td>
                    <td>2011/01/25</td>
                    <td>$112,000</td>
                </tr>
                <tr>
                    <td>Donna Snider</td>
                    <td>Customer Support</td>
                    <td>New York</td>
                    <td>27</td>
                    <td>2011/01/25</td>
                    <td>$112,000</td>
                    <td>New York</td>
                    <td>27</td>
                    <td>2011/01/25</td>
                    <td>$112,000</td>
                    <td>27</td>
                    <td>2011/01/25</td>
                    <td>$112,000</td>
                </tr>
                <tr>
                    <td>Donna Snider</td>
                    <td>Customer Support</td>
                    <td>New York</td>
                    <td>27</td>
                    <td>2011/01/25</td>
                    <td>$112,000</td>
                    <td>New York</td>
                    <td>27</td>
                    <td>2011/01/25</td>
                    <td>$112,000</td>
                    <td>27</td>
                    <td>2011/01/25</td>
                    <td>$112,000</td>
                </tr>
                <tr>
                    <td>Donna Snider</td>
                    <td>Customer Support</td>
                    <td>New York</td>
                    <td>27</td>
                    <td>2011/01/25</td>
                    <td>$112,000</td>
                    <td>New York</td>
                    <td>27</td>
                    <td>2011/01/25</td>
                    <td>$112,000</td>
                    <td>27</td>
                    <td>2011/01/25</td>
                    <td>$112,000</td>
                </tr>
                <tr>
                    <td>Donna Snider</td>
                    <td>Customer Support</td>
                    <td>New York</td>
                    <td>27</td>
                    <td>2011/01/25</td>
                    <td>$112,000</td>
                    <td>New York</td>
                    <td>27</td>
                    <td>2011/01/25</td>
                    <td>$112,000</td>
                    <td>27</td>
                    <td>2011/01/25</td>
                    <td>$112,000</td>
                </tr><tr>
                    <td>Donna Snider</td>
                    <td>Customer Support</td>
                    <td>New York</td>
                    <td>27</td>
                    <td>2011/01/25</td>
                    <td>$112,000</td>
                    <td>New York</td>
                    <td>27</td>
                    <td>2011/01/25</td>
                    <td>$112,000</td>
                    <td>27</td>
                    <td>2011/01/25</td>
                    <td>$112,000</td>
                </tr>
                <tr>
                    <td>Donna Snider</td>
                    <td>Customer Support</td>
                    <td>New York</td>
                    <td>27</td>
                    <td>2011/01/25</td>
                    <td>$112,000</td>
                    <td>New York</td>
                    <td>27</td>
                    <td>2011/01/25</td>
                    <td>$112,000</td>
                    <td>27</td>
                    <td>2011/01/25</td>
                    <td>$112,000</td>
                </tr>
            </tbody>
            <tfoot>
                <tr>
                    <th>Name</th>
                    <th>Position</th>
                    <th>Office</th>
                    <th>Age</th>
                    <th>Start date</th>
                    <th>Salary</th>
                    <th>Header1</th>
                    <th>Header2</th>
                    <th>Header3</th>
                    <th>Header4</th>
                    <th>Header5</th>
                    <th>Header6</th>
                    <th>Header7</th>
                </tr>
            </tfoot>
        </table>
    </div>
</div>
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