remove the wiki color

app/assets/stylesheets/common/base/topic-post.scss

@@ -157,10 +157,6 @@ aside.quote {
   }
 }
 
-.wiki .topic-body {
-  background-color: dark-light-diff($wiki, $secondary, 95%, -50%);
-}
-
 // this ensures consistent top margin on topic posts even if the first line of a post
 // is a top-margin-less element like a list or image.
 .topic-body .regular {
@@ -176,7 +172,7 @@ aside.quote {
   }
   &.wiki {
     cursor: pointer;
-    color: $wiki;
+    color: #408040;
   }
   &.via-email {
     color: dark-light-choose(scale-color($primary, $lightness: 70%), scale-color($secondary, $lightness: 30%));

app/assets/stylesheets/common/foundation/colors.scss

@@ -8,4 +8,3 @@ $highlight:         #ffff4d !default;
 $danger:            #e45735 !default;
 $success:           #009900 !default;
 $love:              #fa6c8d !default;
-$wiki:              #ffffff !default;

config/locales/client.en.yml

@@ -2225,10 +2225,6 @@ en:
           love:
             name: 'love'
             description: "The like button's color."
-          wiki:
-            name: 'wiki'
-            description: "Base color used for the background of wiki posts."
-
 
       email:
         title: "Emails"