how to find theme/template used by site created using Joomla
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I would like to know the theme that is used by some website.

E.g. I would like to know the theme that is used by [this site](http://www.pizzahut.fr/) ([reference](http://community.joomla.org/blogs/community/1271-pizza-hut.html)).

What are the steps to find the theme/template that is used by xyz site.