ISTWCMS-3661: adding border around facebook widget

source/_patterns/04-components/facebook/_facebook.scss

 .uw-facebook {
+  padding: 1rem 0;
   width: 100%;
 
   &__wrapper {
+    border: 1px solid $uw-black;
     margin-left: auto;
     margin-right: auto;
+    max-width: 500px;
     text-align: center;
+    width: 100%;
   }
 }