haskell Shakespeare is a template family for type-safe, efficient templates with simple variable interpolation . Shakespeare templates can be used inline with a quasi-quoter or in an external file. Shakespeare interpolates variables according to the type being inserted. In this case, the variable type needs a ToCss instance. This package contains 2 css template languages. The Cassius language uses whitespace to avoid the need for closing brackets and semi-colons. Lucius does not care about whitespace and is a strict superset of css. There are also some significant conveniences added for css. Please see http://docs.yesodweb.com/book/templates for a more thorough description and examples