updating box id for styling

Author: camp5456

scss/libguides/_library.scss

@@ -176,7 +176,7 @@ $home-secondary-color: #1e988a;
   }
 }
 // image/caption overlay
-#s-lg-box-28870702, s-lg-content-67166876 {
+#s-lg-box-28870702, s-lg-box-28870771 {
   position: relative;
   figcaption {
     position: absolute;