Responsive tables with table-bordered inside a panel have a double border on small devices (under 768px).

Created by: mnhock

<div class="panel panel-default">
    <div class="panel-heading">Panel heading</div>
    <div class="panel-body">
        <p>Some default panel content here.</p>
    </div>

    <div class="table-responsive">
        <table class="table table-bordered">
            <thead>
                <tr>
                    <th>#</th>
                    <th>First Name</th>
                    <th>Last Name</th>
                    <th>Username</th>
                </tr>
            </thead>
            <tbody>
                <tr>
                    <td>1</td>
                    <td>Test</td>
                    <td>Test</td>
                    <td>Test</td>
                </tr>
            </tbody>
        </table>
    </div>
</div>