Online CSS Rule Translator

I am trying to help someone who just started working with me learn CSS. I have given them some reference materials and websites to look through, but I was having trouble finding a specific site which I think would be very useful for them, and others.

A few weeks ago, I came across a website that would translate css rules into easy-to-understand text -- you just had to paste the rule into a textbox, then click a button, and the text translation was displayed below. Unfortunately, I did not bookmark it and I am now no longer able to find that site.

Does anyone know of a site that does something similiar to what I described above?