Apply modal border-radius only to direct children

app/assets/stylesheets/framework/modal.scss

@@ -93,12 +93,12 @@ body.modal-open {
   .modal-content {
     border-radius: $modal-border-radius;
-    *:first-child {
+    > :first-child {
       border-top-left-radius: $modal-border-radius;
       border-top-right-radius: $modal-border-radius;
     }
-    *:last-child {
+    > :last-child {
       border-bottom-left-radius: $modal-border-radius;
       border-bottom-right-radius: $modal-border-radius;
     }