To add a shadow around Social Icons, like Footer on this site.
You can use this code to Custom CSS.
div.socialaccountlinks-v2-block a.sqs-svg-icon--wrapper {
box-shadow: 3px 2px 3px rgba(0,0,0,0.2);
}
You can also use this Social Media Icons tool to add social links, so you can add more style easier without using complex code.

