email-styles.php

<?php

use WPDesk\Library\WPEmail\Helpers\Template;

$params = isset( $params ) ? $params : [];

if ( ! defined( 'ABSPATH' ) ) {
    exit;
}

// Load colors.
$bg        = $params['bg'] ?? '#f9f9f9';
$body      = $params['body'] ?? '#ffffff';
$base      = $params['base'] ?? '#d15291';
$base_text = Template::light_or_dark( $base, '#171717', '#ffffff' );
$text      = $params['text'] ?? '#303030';

// Pick a contrasting color for links.
$link_color = Template::is_hex_light( $base ) ? $base : $base_text;

if ( Template::is_hex_light( $body ) ) {
    $link_color = Template::is_hex_light( $base ) ? $base_text : $base;
}

$bg_darker_10    = Template::hex_darker( $bg, 10 );
$body_darker_10  = Template::hex_darker( $body, 10 );
$base_lighter_20 = Template::hex_lighter( $base, 20 );
$base_lighter_40 = Template::hex_lighter( $base, 40 );
$text_lighter_20 = Template::hex_lighter( $text, 20 );
$text_lighter_40 = Template::hex_lighter( $text, 40 );

// !important; is a gmail hack to prevent styles being stripped if it doesn't like something.
// body{padding: 0;} ensures proper scale/positioning of the email in the iOS native email app.
?>
    body {
    padding: 0;
    }

    #wrapper {
    background-color: <?php echo esc_attr( $bg ); ?>;
    margin: 0;
    padding: 70px 0;
    -webkit-text-size-adjust: none !important;
    width: 100%;
    }

    #template_container {
    box-shadow: 0 1px 4px rgba(0, 0, 0, 0.1) !important;
    background-color: <?php echo esc_attr( $body ); ?>;
    border: 1px solid <?php echo esc_attr( $bg_darker_10 ); ?>;
    border-radius: 3px !important;
    }

    #template_header {
    background-color: <?php echo esc_attr( $base ); ?>;
    border-radius: 3px 3px 0 0 !important;
    color: <?php echo esc_attr( $base_text ); ?>;
    border-bottom: 0;
    font-weight: bold;
    line-height: 100%;
    vertical-align: middle;
    font-family: "Helvetica Neue", Helvetica, Roboto, Arial, sans-serif;
    }

    #template_header h1,
    #template_header h1 a {
    color: <?php echo esc_attr( $base_text ); ?>;
    background-color: inherit;
    }

    #template_header_image img {
    margin-left: 0;
    margin-right: 0;
    }

    #template_footer td {
    padding: 0;
    border-radius: 6px;
    }

    #template_footer #credit {
    border: 0;
    color: <?php echo esc_attr( $text_lighter_40 ); ?>;
    font-family: "Helvetica Neue", Helvetica, Roboto, Arial, sans-serif;
    font-size: 12px;
    line-height: 150%;
    text-align: center;
    padding: 24px 0;
    }

    #template_footer #credit p {
    margin: 0 0 16px;
    }

    #body_content {
    background-color: <?php echo esc_attr( $body ); ?>;
    }

    #body_content table td {
    padding: 48px 48px 32px;
    }

    #body_content table td td {
    padding: 12px;
    }

    #body_content table td th {
    padding: 12px;
    }

    #body_content td ul.wc-item-meta {
    font-size: small;
    margin: 1em 0 0;
    padding: 0;
    list-style: none;
    }

    #body_content td ul.wc-item-meta li {
    margin: 0.5em 0 0;
    padding: 0;
    }

    #body_content td ul.wc-item-meta li p {
    margin: 0;
    }

    #body_content p {
    margin: 0 0 16px;
    }

    #body_content_inner {
    color: <?php echo esc_attr( $text_lighter_20 ); ?>;
    font-family: "Helvetica Neue", Helvetica, Roboto, Arial, sans-serif;
    font-size: 14px;
    line-height: 150%;
    text-align: <?php echo is_rtl() ? 'right' : 'left'; ?>;
    }

    .td {
    color: <?php echo esc_attr( $text_lighter_20 ); ?>;
    border: 1px solid <?php echo esc_attr( $body_darker_10 ); ?>;
    vertical-align: middle;
    }

    .address {
    padding: 12px;
    color: <?php echo esc_attr( $text_lighter_20 ); ?>;
    border: 1px solid <?php echo esc_attr( $body_darker_10 ); ?>;
    }

    .text {
    color: <?php echo esc_attr( $text ); ?>;
    font-family: "Helvetica Neue", Helvetica, Roboto, Arial, sans-serif;
    }

    .link {
    color: <?php echo esc_attr( $link_color ); ?>;
    }

    #header_wrapper {
    padding: 36px 48px;
    display: block;
    }

    h1 {
    color: <?php echo esc_attr( $base ); ?>;
    font-family: "Helvetica Neue", Helvetica, Roboto, Arial, sans-serif;
    font-size: 30px;
    font-weight: 300;
    line-height: 150%;
    margin: 0;
    text-align: <?php echo is_rtl() ? 'right' : 'left'; ?>;
    text-shadow: 0 1px 0 <?php echo esc_attr( $base_lighter_20 ); ?>;
    }

    h2 {
    color: <?php echo esc_attr( $base ); ?>;
    display: block;
    font-family: "Helvetica Neue", Helvetica, Roboto, Arial, sans-serif;
    font-size: 18px;
    font-weight: bold;
    line-height: 130%;
    margin: 0 0 18px;
    text-align: <?php echo is_rtl() ? 'right' : 'left'; ?>;
    }

    h3 {
    color: <?php echo esc_attr( $base ); ?>;
    display: block;
    font-family: "Helvetica Neue", Helvetica, Roboto, Arial, sans-serif;
    font-size: 16px;
    font-weight: bold;
    line-height: 130%;
    margin: 16px 0 8px;
    text-align: <?php echo is_rtl() ? 'right' : 'left'; ?>;
    }

    a {
    color: <?php echo esc_attr( $link_color ); ?>;
    font-weight: normal;
    text-decoration: underline;
    }

    img {
    border: none;
    display: inline-block;
    font-size: 14px;
    font-weight: bold;
    height: auto;
    outline: none;
    text-decoration: none;
    text-transform: capitalize;
    vertical-align: middle;
    margin-<?php echo is_rtl() ? 'left' : 'right'; ?>: 10px;
    max-width: 100%;
    }
<?php