center test

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

@@ -82,12 +82,14 @@ public class MyGame extends SimpleApplication {
 
 == Water
 
+[.float-group]
+--
 [.center]
-image:effect/water-post.png[water-post.png,width="150",height="100",align="center"]
-image:effect/water.png[water.png,width="150",height="100",align="center"]
-image:effect/water-reflection-muddy.png[water-reflection-muddy.png,width="150",height="100",align="center"]
-image:effect/underwater2.jpg[underwater2.jpg,width="150",height="100",align="center"]
-
+image:effect/water-post.png[water-post.png,width="150",height="100"]
+image:effect/water.png[water.png,width="150",height="100"]
+image:effect/water-reflection-muddy.png[water-reflection-muddy.png,width="150",height="100"]
+image:effect/underwater2.jpg[underwater2.jpg,width="150",height="100"]
+--
 The jMonkeyEngine xref:jme3/advanced/water.adoc["`SeaMonkey WaterFilter`"] simulates ocean waves, foam, including cool underwater caustics. +
 Use the SimpleWaterProcessor (SceneProcessor) for small, limited bodies of water, such as puddles, drinking troughs, pools, fountains.