Editor: Make Trailing Whitespace evident

crib-editor3/cribjs.css

@@ -17,3 +17,8 @@ iframe {
   bottom: 0;
   position: fixed;
 }
+
+.cm-trailingspace {
+  background-color: #cd0000;
+}
+

gadget/codemirror.gadget.html

@@ -16,15 +16,6 @@
 
     <!-- Trailing spaces -->
     <script src="../lib/codemirror/addon/edit/trailingspace.js"></script>
-    <style type="text/css">
-      .cm-trailingspace {
-        background-color: gray;
-      }
-      body {
-        padding: 0;
-        margin: 0;
-      }
-    </style>
 
     <!-- Rulers -->
     <script src="../lib/codemirror/addon/display/rulers.js"></script>