I've used to hamlet to produce an internal stylesheet as follows:
style = [hamlet|<style type=text/css> h3 {margin-bottom: 0} |]
How might this be rewritten to use Cassius/Lucius instead of plain text?
toWidget [lucius|
h3 {
margin-bottom: 0;
}
|]
Will produce a Yesod widget which contains your CSS. The Yesod book http://www.yesodweb.com/book has some very enlightening examples of this kind of thing.