My theme (Brooklyn) allows for certain default social channels to be added, like Facebook and Instagram which we've already added.
However I want to also add LinkedIn as that's where we have the most followers.
I know how to add the hover effect I desire to this icon, I just don't know how to manually add the LinkedIn icon to the .social-icons class.
You can follow the similar process as stated in the other post, it's well explained. The example is for TikTok & Spotify footer Icons, but you can just replace it with LinkedIn. You'll be modding quite a few files, so I recommend you to Duplicate (backup) your current theme.
Potentially there is an issue with vertical-allign or there is an issue with the container. Closely observe every selector element and its respective properties in CSS.
+ LinkedIn icon seems to be larger in size than others.