diff --git a/app/controllers/problems_controller.rb b/app/controllers/problems_controller.rb
--- a/app/controllers/problems_controller.rb
+++ b/app/controllers/problems_controller.rb
@@ -63,6 +63,15 @@
     redirect_to :action => 'list'
   end
 
+  def turn_all_off
+    Problem.find(:all,
+                 :conditions => "available = 1").each do |problem|
+      problem.available = false
+      problem.save
+    end
+    redirect_to :action => 'list'
+  end
+
   def stat
     @problem = Problem.find(params[:id])
     @submissions = Submission.find_all_last_by_problem(params[:id])
diff --git a/app/views/problems/list.rhtml b/app/views/problems/list.rhtml
--- a/app/views/problems/list.rhtml
+++ b/app/views/problems/list.rhtml
@@ -1,5 +1,6 @@
 <% content_for :head do %>
   <%= stylesheet_link_tag 'scaffold' %>
+  <%= stylesheet_link_tag 'problems' %>
   <%= javascript_include_tag :defaults %>
 <% end %>
 
@@ -9,7 +10,8 @@
 <%= link_to 'Main', :controller => 'main', :action => 'list' %>
 </div>
 
-<%= link_to 'New problem', :action => 'new' %><br/>
+<%= link_to 'New problem', :action => 'new' %>
+<%= link_to 'Turn off all problems', :action => 'turn_all_off' %><br/>
 
 <table>
   <tr>
@@ -21,7 +23,7 @@
   </tr>
   
 <% for problem in @problems %>
-  <tr>
+  <tr class="<%= (problem.available) ? "available" : "not-available" %>">
     <% @problem=problem %>
     <td><%= in_place_editor_field :problem, :name, {}, :rows=>1 %>
     <td><%= in_place_editor_field :problem, :full_name, {}, :rows=>1 %>
diff --git a/public/stylesheets/application.css b/public/stylesheets/application.css
--- a/public/stylesheets/application.css
+++ b/public/stylesheets/application.css
@@ -1,14 +1,9 @@
+/* Normal text */
 p {
     font-size: 12px;
 }
 
-div.title {
-    font-size: 20px;
-    font-weight: bold;
-    background: lightgreen;
-    padding: 2px;
-}
-
+/* This is the main menu bad*/
 div.userbar { 
     border-top: thin solid grey;
     border-bottom: thin solid grey;
@@ -16,39 +11,15 @@
     font-size: 12px;
 }
 
-div.compilermsgbody {
-    font-family: monospace;
-}
-
-div.submitbox {
-    border: thin solid black;
-    padding: 5px;
-    color: white;
-    background-color: #777777;
+/* This is the top bar, displaying user's full name */
+div.title {
+    font-size: 20px;
     font-weight: bold;
-    font-size: 13px;
+    background: lightgreen;
+    padding: 2px;
 }
 
-table.uinfo {
-    border-collapse: collapse;
-    border: 1px solid black;
-    font-size: 13px;
-}
-
-td.uinfo {
-    vertical-align: top;
-    border: 1px solid black;
-    padding: 5px;
-}
-
-th.uinfo {
-    background: lightgreen;
-    vertical-align: top;
-    text-align: right;
-    border: 1px solid black;
-    padding: 5px;
-}
-
+/* Standard table with header and rows with alternating background */
 table.info {
     border: 1px solid black;
     border-collapse: collapse;
@@ -77,6 +48,48 @@
     background: #f0f0f0;
 }
 
+/*******************************
+ [Main]
+********************************/
+div.submitbox {
+    border: thin solid black;
+    padding: 5px;
+    color: white;
+    background-color: #777777;
+    font-weight: bold;
+    font-size: 13px;
+}
+
+/*******************************
+ [Settings]
+********************************/
+table.uinfo {
+    border-collapse: collapse;
+    border: 1px solid black;
+    font-size: 13px;
+}
+
+td.uinfo {
+    vertical-align: top;
+    border: 1px solid black;
+    padding: 5px;
+}
+
+th.uinfo {
+    background: lightgreen;
+    vertical-align: top;
+    text-align: right;
+    border: 1px solid black;
+    padding: 5px;
+}
+
+/*******************************
+ [Submission]
+********************************/
+div.compilermsgbody {
+    font-family: monospace;
+}
+
 div.task-menu {
     text-align: center;
     font-size: 13px;
diff --git a/public/stylesheets/problems.css b/public/stylesheets/problems.css
new file mode 100644
--- /dev/null
+++ b/public/stylesheets/problems.css
@@ -0,0 +1,8 @@
+
+tr.available {
+    background: #c0ffc0;
+}
+
+tr.not-available {
+    background: #ffc0c0;
+}