Solved. 

Okay, so the first code does work, but as you stated, it only targets the WRAPPER SIZE and not the actual icon itself inside the wrapper. But I may have figured it out slightly with some other help, finally. This it what I have now and it seems good,...

Hi @TheScriptFlow_, Thank you for your reply. Can I use the custom CSS box in the footer section to input these codes, or will it need to be in the code editor?

Hi @devcoders,URL is https://lryv7tj9xxzi1sgg-9984671841.shopifypreview.comI think.

I don't know how to do that, unfortunately. 

Still no help with resizing social media icons after the Studio Theme 15.3  update.

https://admin.shopify.com/store/the-6ix-side-inc/themes/126316576865/editor

I don't use WhatsApp.

Would that be the reasoning behind the yellow underlining? With the message displayed, "icon-facebook" does not appear to be used in this section. Try a different selector.

Not helpful at all.

  How can I resize my social media icons in my footer menu? I have version 14.0, which is still working fine with the custom CSS used in the footer section. The new update to version 15.3 is not working now.