How does one use font-awesome with mjml?

I am trying to implement an email template that uses font awesome with mjml, I am not sure how to go about this. I have tried using a cdn as follows:

<mj-head>
    <mj-title>Thank you!</mj-title>
    <mj-style>
      <mj-include path="https://stackpath.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css"/>

    </mj-style>
    <mj-attributes>
      ...
    </mj-attributes>
  </mj-head>

...
  <mj-text align="center">
        <h3>              
                 Share <i class="fab fa-facebook-f"></i> 
        </h3>
  </mj-text>
...

However this is not functional. Can anyone advise me how best to accomplish this?