The social share element is found in article.html

<div class="social-share clearfix">
  <p class="title">Share on:</p>
  <ul class="share-icons">
   <li class="share-email"><a href="#"><i class="fas fa-envelope"></i></a></li>
   <li class="share-pinterest"><a href="#"><i class="fab fa-pinterest-p"></i></a></li>
   <li class="share-facebook"><a href="#"><i class="fab fa-facebook-f"></i></a></li>
   <li class="share-twitter"><a href="#"><i class="fab fa-twitter"></i></a></li>
   <li class="share-linkedin"><a href="#"><i class="fab fa-linkedin-in"></i></a></li>
  </ul>
</div>

The icons are created with fontawesome

The style can be modified on app/css/scss/elements/_socialShare.scss

The other social icons found on the template are on contact.html and in the footer on all the pages.

The styles of this markup is found in app\css\scss\_general.scss

and

app\css\scss\_site-footer.scss