Customized email footer

footer.php

<?php
/**
 * Email Footer
 *
 * Override this template by copying it to yourtheme/charitable/emails/footer.php
 *
 * @author  Studio 164a
 * @package Charitable/Templates/Emails
 * @version 1.0.0
 */

// Exit if accessed directly.
if ( ! defined( 'ABSPATH' ) ) {
    exit;
}

// For gmail compatibility, including CSS styles in head/body are stripped out therefore styles need to be inline. These variables contain rules which are added to the template inline.
$template_footer = "
    border-top:0;
    -webkit-border-radius:3px;
";

$credit = "
    border:0;
    color: #000000;
    font-family: 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif;
    font-size:12px;
    line-height:125%;
    text-align:center;
";
?>
                                                            </div>
                                                        </td>
                                                    </tr>
                                                    <!-- Start custom content -->
                                                    <tr>
                                                        <td>
                                                            This is some custom content.
                                                        </td>
                                                    <tr>
                                                    <!-- End custom content -->
                                                </table>
                                                <!-- End Content -->
                                            </td>
                                        </tr>
                                    </table>
                                    <!-- End Body -->
                                </td>
                            </tr>
                            <tr>
                                <td align="center" valign="top">
                                    <!-- Footer -->
                                    <table border="0" cellpadding="10" cellspacing="0" width="600" id="template_footer" style="<?php echo $template_footer; ?>">
                                        <tr>
                                            <td valign="top">
                                                <table border="0" cellpadding="10" cellspacing="0" width="100%">
                                                    <tr>
                                                        <td colspan="2" valign="middle" id="credit" style="<?php echo $credit; ?>">
                                                            <?php
                                                                echo wpautop(
                                                                    wp_kses_post(
                                                                        wptexturize(
                                                                            /**
                                                                             * Filter the email footer text & link.
                                                                             *
                                                                             * @since 1.0.0
                                                                             *
                                                                             * @param string $text The default text.
                                                                             */
                                                                            apply_filters( 'charitable_email_footer_text', '<a href="' . esc_url( home_url() ) . '">' . get_bloginfo( 'name' ) . '</a>' )
                                                                        )
                                                                    )
                                                                );
                                                            ?>
                                                        </td>
                                                    </tr>
                                                </table>
                                            </td>
                                        </tr>
                                    </table>
                                    <!-- End Footer -->
                                </td>
                            </tr>
                        </table>
                    </td>
                </tr>
            </table>
        </div>
    </body>
</html>