[MD Bookmarks] Edit Bookmarks.

chrome/browser/resources/md_bookmarks/shared_style.html

 <link rel="import" href="chrome://bookmarks/shared_vars.html">
 
 <dom-module id="shared-style">
   <template>
     <style>
       [hidden] {
         display: none !important;
       }
 
       button.more-vert-button {
         height: 36px;
         padding: 8px;
         width: 36px;
       }
 
       button.more-vert-button div {
         border: 2px solid var(--secondary-text-color);
         border-radius: 2px;
         margin: 1px 8px;
         pointer-events: none;
         transform: scale(0.8);
       }
 
       hr {
         background: rgba(0, 0, 0, 0.11);
         border-width: 0;
         height: 1px;
         margin: 8px 0;
       }
+
+      paper-button {
+        height: 32px;
+        margin: 0;
+      }
     </style>
   </template>
 </dom-module>