Outlook 2016 does not display fonts in HTML sheets, how to fix it?

Question

Outlook

In Outlook normal (the one in Windows 10 standard), fonts display normally, I used:

<!--[if mso]>
    <style type="text/css">
    body, table, td, p, a, h1 {font-family: Arial, Helvetica, sans-serif !important;}
    </style>
<![endif]-->

How to make fonts display normally in Outlook 2016 too?