add other themes in the site?

add other themes in the site?

 I want to add a different template/theme for my wiki so I googled and found one of them from here. http://www.freewebsitetemplates.com

I download the theme I wanted (CSS) and tried to put that CSS file (althought it had several other files with it) in my site and it doesn't change anything. 

What can I do?

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