stack

docs/modules/core/pages/effect/effects_overview.adoc

@@ -82,7 +82,7 @@ public class MyGame extends SimpleApplication {
 
 == Water
 
-[float-group]
+[.float-group]
 --
 [.right]
 image::effect/water-post.png[water-post.png,width="150",height="100"]