newsupernova/vendor/dotmailer/dotmailer-magento2-extension/view/frontend/templates/email/coupon.phtml

<?php
/** @var \Dotdigitalgroup\Email\Block\Coupon $block */
// @codingStandardsIgnoreFile
?>
<?php $coupon = $block->generateCoupon(); ?>
<?php if ($coupon) : ?>
    <?php $style = $block->getStyle(); ?>
    <style>
        .edc-coupon{
            color: <?= $block->escapeHtml($block->getCouponColor());?>;
            font-size: <?= $block->escapeHtml($block->getFontSize());?>;
        <?php if (in_array('bold', $style)) : ?>
            font-weight: bold;
        <?php endif; ?><?php if (in_array('italic', $style)) : ?>
            font-style: italic;
        <?php endif; ?><?php if (in_array('underline', $style)) : ?>
            text-decoration: underline;
        <?php endif; ?>
            font-family: <?= $block->escapeHtml($block->getFont());?>;
            background-color: <?= $block->escapeHtml($block->getBackgroundColor());?>;
        }
    </style>
    <div class="edc-coupon">
        <?= $block->escapeHtml($coupon); ?>
    </div>
<?php endif;