diff --git a/app/views/problems/toggle.js.haml b/app/views/problems/toggle.js.haml
--- a/app/views/problems/toggle.js.haml
+++ b/app/views/problems/toggle.js.haml
@@ -2,7 +2,7 @@
                   locals: {button_id: "#problem-avail-#{@problem.id}",button_on: @problem.available }
 :plain
   r = $("#prob-#{@problem.id}");
-  r.removeClass('success');
-  r.removeClass('danger');
-  r.addClass("#{@problem.available? ? 'success' : 'danger'}");
+  r.removeClass('bg-success');
+  r.removeClass('bg-danger');
+  r.addClass("#{@problem.available? ? 'bg-success' : 'bg-danger-'}");