[Haskell-beginners] Snap layouts | app examples

Dear Haskellers Can you provide me with example of layout'ing system for snap. I mean something like layouts in "rails" So if you have a standard heist layout for actions like index, show, edit i would like to have a global application layout that will have javascripts/css tags and rest of "action" layouts will be just yield inside of it. I don't know if this description is perfect :D. ps. example of medium size snap applications would also be nice. Kind regards Jakub Oboza