说明：
替换$content代码
或者
直接用我在文后分享的文件替换

打开/wp-content/themes/zibll/inc/functions/zib-email.php文件

将以下代码替换PHP文件内$content

$content = '
    <div class="email-content" style="width:90%;max-width:660px;margin:20px auto 30px;line-height:1.5;text-align:left;overflow:hidden;border-radius:8px;box-shadow:0 2px 12px 0 rgba(0,0,0,0.1);">
        <div style="overflow:hidden;">
          <h1 class="email-title" style="position:relative;margin:0;-webkit-box-sizing:border-box;box-sizing:border-box;padding:14px 52px 14px 20px;line-height:1.6;font-size:16px;font-weight:normal;color:#fff;background:-webkit-linear-gradient(-45deg,rgba(9,69,138,0.2),rgba(68,155,255,0.7),rgba(117,113,251,0.7),rgba(68,155,255,0.7),rgba(9,69,138,0.2));background:linear-gradient(-45deg,rgba(9,69,138,0.2),rgba(68,155,255,0.7),rgba(117,113,251,0.7),rgba(68,155,255,0.7),rgba(9,69,138,0.2));background-size:400% 400%;background-position:50% 100%;">
            Dear, 您在『'.$blog_name.'』上的留言有了新的回复！
            <img class="icon" style="position:absolute;right:20px;top:12px;opacity:0.9;width:28px;" src="data:image/png;base64,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"><img>
          </h1>
          <div class="email-text" style="padding:20px 28px 10px;background:#fff;">
            ' . $message . '
          </div>
          <div class="email-footer" style="padding:10px 20px;border-top:1px solid #eee;">
            <p style="margin:0;padding:0;line-height:24px;font-size:13px;color:#999;">* 注意：此邮件由 <a href="https://7boe.top" target="_blank" style="color:#9f98ff;text-decoration:none;">' . $blog_name . '</a> 自动发出，请勿回复，如有打扰，请见谅。</p>
            <p style="margin:0;padding:0;line-height:24px;font-size:13px;color:#999;">' . $con_more . '</p>
          </div>
        </div>
    </div>
';

说明：
需上传邮件背景图片到同目录，在附件下载，且覆盖前需修改$blog_eng_name和$blog_url
或者
直接用我在文后分享的文件替换
特别地，如若设置了图片防盗链，邮件图片会不显示，请将图片上传到公益图床并自行替换图片url

打开/wp-content/themes/zibll/inc/functions/zib-email.php文件

将以下代码替换PHP文件内$content

    $blog_url = 'https://www.m78.co';//此处请自行修改
    $blog_eng_name = 'Nebula Blog';//此处请自行修改
    $content = '
    <div style="display: flex; align-items: center; padding: 15px; color: #666666; font-size: 14px; line-height: 1.5; word-break: break-all;">
        <div style="overflow: hidden; width: 500px; margin: 0 auto; box-sizing: border-box; border: 1px solid #ee9ea8; box-shadow: 0px 0px 20px #cccccc; border-radius: 5px;">
            <div>
                <img style="display: block; width: 100%;" src="'.ZIB_TEMPLATE_DIRECTORY_URI . '/inc/functions/zib-email-bg.png'.';">
                <div style="display: inline-block; margin-left: 20px; padding: 7px 20px; background: #ee9ea8; color: #ffffff; text-align: center; box-shadow: 3px 3px 5px rgba(0, 0, 0, 0.3); border-radius: 3px; transform: translateY(-20px);">Dear</div>
            </div>
            <div style="padding: 30px 20px;">
                <div style="padding: 5px 15px; background: #f5f5f5; border-radius: 3px;">
                '.$message.'
                </div>
                <div style="display: flex; flex-direction: column; align-items: center; margin-top: 50px;">
                    <a style="padding: 7px 20px; background: #ee9ea8; color: #ffffff; text-decoration: none; box-shadow: 3px 3px 5px rgba(0, 0, 0, 0.3); border-radius: 3px;" href="'.$blog_url.'" target="_blank">访问博客</a>
                    <div style="margin-top: 30px; text-align: center; font-size: 12px;">本邮件为系统自动发出<br>Copyright © '.date("Y").'<br><a style="color: #666666; text-decoration: none;" href="'.$blog_url.'" target="_blank">'.$blog_eng_name.'</a>. All Rights Reserved</div>
                </div>
            </div>
        </div>
    </div>
	';