Add margin-bottom to social media links (#1441)

Author: timangus

assets/css/beautifuljekyll.css

@@ -440,7 +440,10 @@ footer a:focus {
 footer .list-inline {
   margin: 0;
   padding: 0;
-  margin-bottom: 1.875rem;
+  margin-bottom: 1.375rem;
+}
+footer .list-inline .list-inline-item {
+  margin-bottom: 0.5rem;
 }
 footer .copyright {
   font-family: var(--header-font);