fix dark color

packages/app/src/styles/theme/_apply-colors-dark.scss

@@ -257,10 +257,10 @@ ul.pagination {
 
   // Pagetree
   .grw-pagetree {
+    .grw-pagetree-is-over {
+      background: $gray-900;
+    }
     .grw-pagetree-item {
-      .grw-pagetree-is-over {
-        background: $gray-900;
-      }
       &.grw-pagetree-is-target {
         background: $bgcolor-list-hover;
       }