How/Where do I find the CSS source-code for Bootstrap classes?

How/Where do I find the CSS source-code for Bootstrap classes?
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#1

I’d like to view the CSS source-code for bootstrap classes to learn better CSS and also to better override the bootstrap classes. I was hoping there would be an in-depth reference with source-code, but I had no such luck finding such a resource online. I have downloaded bootstrap, so I was wondering where to find the CSS within the bootstrap-3.3.6 directory for something specific like img-responsive.

Thanks in advance!


#2