Update plugin.rb

plugin.rb

@@ -10,6 +10,6 @@ class Onebox::Engine::HackMdOnebox
 
   # See https://github.com/ether/etherpad-lite/wiki/Embed-Parameters
   def to_html
-    "<iframe name='embed_readwrite' src='#{@url}?both' style='border-width:0' frameborder='0' scrolling='no' width='100%' height=800></iframe><br><a href='#{@url}' target='_blank'>Aller à la note</a>"
+    "<iframe name='embed_readwrite' src='#{@url}?both' style='border-width:0' frameborder='0' scrolling='no' width='100%' height=800></iframe><br><a href='#{@url}?both' target='_blank'>Aller à la note</a>"
   end
 end