Set size of ACE Editor.

cms/static/js/models/settings/advanced.js

@@ -8,7 +8,7 @@ CMS.Models.Settings.Advanced = Backbone.Model.extend({
     initialize: function() {
         console.log('in initialize');
         var editor = ace.edit('course-advanced-policy-1-value');
-        editor.setTheme("ace/theme/monokai");
-        editor.getSession().setMode("ace/mode/javascript");
+        editor.setTheme("ace/theme/chrome");
+        editor.getSession().setMode("ace/mode/json");
     }
 });

cms/static/sass/_settings.scss

@@ -550,6 +550,10 @@
     }
 
     .settings-advanced {
+      .ace {
+          height: 80px;
+          border: 1px solid #DDD;
+       }
 
       .course-advanced-policy-list {