How to attach CSS file in Sharepoint 2010

I need to attach a custom CSS that all sites in a site collection can use it. I don't have publishing features enabled. Where do I save that CSS file and how do I properly attach it?
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The custom style sheet property of the site has been removed in 2010.  You have to create a custom master page with it attached.  This can be done very easily with SharePoint designer.  just copy the OOB one you use and add the link.
MisUszatekAuthor Commented:
Because that's the solution.
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