mj-social-border-radius.mjml

<mjml>
  <mj-body>
    <mj-section>
      <mj-column>
        <mj-social border-radius="1px">
          <mj-social-element name="instagram" border-radius="3px" css-class="testing">
						Instagram
          </mj-social-element>
          <mj-social-element name="linkedin" font-family="Comic">
            LinkedIn
          </mj-social-element>
          <mj-social-element  name="medium" font-size="15px">
            Medium
          </mj-social-element>
        </mj-social>
      </mj-column>
    </mj-section>
  </mj-body>
</mjml>