diff --git a/src/lib.rs b/src/lib.rs
index 7800448..85dc9f2 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -715,7 +715,7 @@ where
         renderer: &Renderer,
         viewport: &Rectangle,
         translation: Vector,
-    ) -> Option<overlay::Element<'b, Message, Theme, Renderer>> {
+    ) -> Vec<overlay::Element<'b, Message, Theme, Renderer>> {
         overlay::from_children(
             &mut self.children,
             tree,
@@ -730,10 +730,11 @@ where
         &mut self,
         tree: &mut Tree,
         layout: Layout<'_>,
+        viewport: &Rectangle,
         renderer: &Renderer,
         operation: &mut dyn Operation,
     ) {
-        operation.container(None, layout.bounds());
+        operation.container(None, layout.bounds(), viewport);
         operation.traverse(&mut |operation| {
             self.children
                 .iter_mut()
@@ -742,7 +743,7 @@ where
                 .for_each(|((child, state), layout)| {
                     child
                         .as_widget_mut()
-                        .operate(state, layout, renderer, operation);
+                        .operate(state, layout, viewport, renderer, operation);
                 });
         });
     }