changes to button-wrapper class to remoev issue #19 from github

templates/index.mustache

@@ -86,7 +86,7 @@
                     </button>
                 {{/useprintcomments}}
 
-                <button id="toolbar-dropdown-button" class="pdf-annotator-hidden" type="button" data-toggle="collapse" data-target="#navbarNavAltMarkup" aria-controls="navbarNavAltMarkup" aria-expanded="false" aria-label="Toggle navigation">
+                <button id="toolbar-dropdown-button" class="pdf-annotathidden" type="button" data-toggle="collapse" data-target="#navbarNavAltMarkup" aria-controls="navbarNavAltMarkup" aria-expanded="false" aria-label="Toggle navigation">
                     <i class="icon fa fa-bars fa-lg"></i>
                 </button>
             </div>