Style disabled inputs

assets/stylesheets/wizard/wizard_custom.scss

@@ -199,6 +199,11 @@
       line-height: 24px;
     }
 
+    input[disabled] {
+      background-color: #e9e9e9;
+      border: #e9e9e9;
+    }
+
     ul {
       padding: 0;
     }