update elements and fix some bugs

lib/src/iron-doc-viewer/iron-doc-property.css

 /*
 @license
 Copyright (c) 2015 The Polymer Project Authors. All rights reserved.
 This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
 The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
 The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
 Code distributed by Google as part of the polymer project is also
 subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
 */
 :host {
@@ skipping 42 matching lines @@
 
 :host([function]) #type {
   display: none;
 }
 
 #details {
   margin-left: 160px;
   flex: 1;
 }
 
+@media (max-width: 500px) {
+  #details {
+    margin-left: 0;
+  }
+}
+
 /* Metadata */
 
 #meta {
   display: flex;
 }
 
 #type {
   @apply(--paper-font-code1);
 }
 
@@ skipping 73 matching lines @@
 }
 :host([_collapsed]) #meta {
   opacity: 0;
 }
 :host([_collapsed]) #desc {
   transform: translateY(-34px);
 }
 :host([_collapsed][function]) #desc {
   opacity: 0;
 }