Added changes to wiki 404 and fixed CMS Sass

cms/static/sass/_base.scss

@@ -14,6 +14,11 @@ $yellow: #fff8af;
 $cream: #F6EFD4;
 $border-color: #ddd;
 
+// edX colors
+$blue: rgb(29,157,217);
+$pink: rgb(182,37,104);
+
+
 @mixin hide-text {
   background-color: transparent;
   border:           0;

lms/static/sass/course/wiki/_wiki.scss

@@ -767,6 +767,39 @@ section.wiki {
       text-decoration: none;
     }
   }
+
+  .missing {
+    max-width: 400px;
+    margin: lh(2) auto;
+    display: block;
+    overflow: hidden;
+    background: $pink;
+    padding: lh();
+    @include box-shadow(inset 0 0 0 1px lighten($pink, 10%));
+    border: 1px solid darken($pink, 15%);
+
+    p {
+      color: #fff;
+
+      a {
+        display: block;
+        background: darken($pink, 8%);
+        margin: lh() (-(lh())) (-(lh()));
+        padding: lh();
+        border-top: 1px solid darken($pink, 15%);
+        color: #fff;
+        font-weight: bold;
+        font-size: em(18);
+        @include transition;
+        text-align: center;
+        -webkit-font-smoothing: antialiased;
+
+        &:hover {
+          background: darken($pink, 12%);
+        }
+      }
+    }
+  }
 }
 
 .modal-backdrop {

lms/templates/wiki/wiki-404.html

@@ -10,9 +10,8 @@
 
 {% block wiki_contents %}
 
-  <div class="missing-wrapper">
-    <p>This article was not found, and neither was the parent. <a href="#">Go back to the main wiki article.</a></p>
-    <button type="submit">Create a new article</button>
+  <div class="missing">
+    <p>This article was not found, and neither was its parent article. <a href="#">Go back to the main wiki article</a></p>
   </div>
 
 {% endblock %}