diff --git a/src/General/css/style.css b/src/General/css/style.css
index e6380c526..50028a15e 100755
--- a/src/General/css/style.css
+++ b/src/General/css/style.css
@@ -1405,7 +1405,7 @@ div.boardTitle {
   padding-right: 7px;
   top: 5px;
 }
-.gal-pdf .gal-buttons {
+:root.gal-pdf .gal-buttons {
   top: 40px;
   background: rgba(0,0,0,0.6) !important;
   border-radius: 3px;
diff --git a/src/Images/Gallery.coffee b/src/Images/Gallery.coffee
index b0c29cf33..b1890f650 100644
--- a/src/Images/Gallery.coffee
+++ b/src/Images/Gallery.coffee
@@ -134,7 +134,7 @@ Gallery =
       elType = 'img'
       elType = 'video' if /\.webm$/.test(@href)
       elType = 'iframe' if /\.pdf$/.test(@href)
-      $[if elType is 'iframe' then 'addClass' else 'rmClass'] nodes.el, 'gal-pdf'
+      $[if elType is 'iframe' then 'addClass' else 'rmClass'] doc, 'gal-pdf'
       file = $.el elType,
         src:   name.href     = @href
         title: name.download = name.textContent = @title