Make treemenu a singleton

Change-Id: I0cb71df1f80c0f5d9f134a7fcf4563c3719d2302
diff --git a/dev/scss/main/kwic.scss b/dev/scss/main/kwic.scss
index b99057d..9927be3 100644
--- a/dev/scss/main/kwic.scss
+++ b/dev/scss/main/kwic.scss
@@ -208,11 +208,13 @@
   }
 }
 
-div.action.bottom {
+// More is defined in vc.scss
+p.ref div.action.bottom {
   display: inline-block;
   margin-right: .5em;
   > span {
     position: relative;
+    box-shadow: none;
   }
 }