mj-navbar.mjml

<mjml>
  <mj-body>
    <mj-section>
      <mj-column>
        <mj-navbar base-url="https://jolimail.io" hamburger="hamburger">
            <mj-navbar-link href="/hello">Hello</mj-navbar-link>
            <mj-navbar-link href="/about" target="_self">About</mj-navbar-link>
        </mj-navbar>
      </mj-column>
    </mj-section>
  </mj-body>
</mjml>