让div变得大方美观 bootstrap

<div class="panel panel-default ">
    <div class="panel-heading">
        <h3 class="panel-title"></h3>
    </div>
    <div class="panel-body">
        <table class="table table-hover">
            <tr class="warning">
                <td></td>
                <td></td>
                <td></td>
            </tr>
            <tr>
                <td></td>
                <td></td>
                <td></td>
            </tr>
        </table>
    </div>
</div>