Index: trunk/styles/standard/elemstyles.mapcss
===================================================================
--- trunk/styles/standard/elemstyles.mapcss	(revision 7154)
+++ trunk/styles/standard/elemstyles.mapcss	(revision 7155)
@@ -839,5 +839,5 @@
 /**************/
 
-area[piste:difficulty=easy]:closed {
+area[piste:difficulty=easy]:closed::core_piste {
     fill-color: piste_easy#0000ff;
 }
@@ -848,5 +848,5 @@
     color: piste_easy#0000ff;
 }
-area[piste:difficulty=intermediate]:closed {
+area[piste:difficulty=intermediate]:closed::core_piste {
     fill-color: piste_intermediate#ff0000;
 }
@@ -857,5 +857,5 @@
     color: piste_intermediate#ff0000;
 }
-area[piste:difficulty=advanced]:closed {
+area[piste:difficulty=advanced]:closed::core_piste {
     fill-color: piste_advanced#606060;
 }
@@ -866,5 +866,5 @@
     color: piste_advanced#606060;
 }
-area[piste:difficulty=expert]:closed {
+area[piste:difficulty=expert]:closed::core_piste {
     fill-color: piste_expert#606060;
 }
@@ -875,5 +875,5 @@
     color: piste_expert#606060;
 }
-area[piste:difficulty=freeride]:closed {
+area[piste:difficulty=freeride]:closed::core_piste {
     fill-color: piste_freeride#ffff00;
 }
@@ -884,5 +884,5 @@
     color: piste_freeride#ffff00;
 }
-area[piste:difficulty=novice]:closed {
+area[piste:difficulty=novice]:closed::core_piste {
     fill-color: piste_novice#00ff00;
 }