[web-devel] How to create Cassius Mixin?

Hello. How can I create a CSS mixin with Cassius (from Yesod Haskell Web Framework) ? For instance, this code: transition val = [cassiusMixin| -webkit-transition: #{val} -moz-transition: #{val} -ms-transition: #{val} -o-transition: #{val} transition: #{val} |] does not work because cassiusMixin does not exist. Is there a way to create a mixin with cassius? If not, is cassius a limited version of lucius? Thanks.