.pandoc/templates/mail.html5

<!DOCTYPE html>
<html$if(lang)$ lang="$lang$"$endif$$if(dir)$ dir="$dir$"$endif$>
  <head>
    <meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=yes">
    <style type="text/css">
      code{white-space: pre;} body{font-family:sans-serif} p{line-height:1.2em}
      blockquote{margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex}
      $if(quotes)$q { quotes: "“" "”" "‘" "’"; } $endif$
      $if(highlighting-css)$ $highlighting-css$ $endif$
    </style>
  </head>
  <body>
$body$
  </body>
</html>