Can you use a free CSS template to create a Joomla template?

Can you use a free CSS template to create a Joomla template and host up this joomla template in my site for my users to download?
Update: Emma. Thank you for your reply. I am a joomla developer and I will be able to do this easily.

However, my question is about licensing. Can I convert this free template, make it a Joomla template and gain profit from it ?
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