diff --git a/styles.css b/styles.css
index e52d72c2c987d2e68d4c253e3c05b5d2088b4443..60b6bac1e2e2f4bf452f5f1e9d169bbdf948a36e 100644
--- a/styles.css
+++ b/styles.css
@@ -1,4 +1,4 @@
-.path-mod-pdfannotator .hidden {
+.path-mod-pdfannotator .pdf-annotator-hidden {
     display: none;
     visibility: hidden;
 }
diff --git a/templates/index.mustache b/templates/index.mustache
index d7ef2c1d80bfff9ef460356536f048f0b8068d53..a7c0f9e118c5246b4db66fb1d388b14be409c0ab 100644
--- a/templates/index.mustache
+++ b/templates/index.mustache
@@ -86,7 +86,7 @@
                     </button>
                 {{/useprintcomments}}
 
-                <button id="toolbar-dropdown-button" class="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-annotator-hidden" 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>