Source: dist/css/library_boot.css, line 8571
10.1.2 Favorite/Bookmark Button
This button has an active and deactivate state depending on the users select of that media item.
Example s
<a class="inline-block m-x_n3 m-t_n1 [modifier]">
<span class="fa-stack fa-2x a:c_alert-n2 c_secondary-2 h:c_alert-n3">
<i class="fas fa-bookmark fa-stack-2x c_inherit-all text-shadow_black-1"></i>
<i class="fa-heart c_black-4 h:c_white a:c_white fa-stack-1x fas font-size_down-1 text-shadow_black-n1"></i>
</span>
</a>