CF6 Custom CSS

I've tried searching the forums, and using Google, but I can't seem to find the proper info for ChronoForms 6.
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I want to change the default form CSS to another CSS file, or to edit the existing file.
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But, I can't seem to locate the CF6 CSS file on the server.
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I also do not see anywhere in the form editor to change the form style/css file.
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Any help would be appreciated.

what exactly you are trying to change ? the whole CSS or you want to override some rules ?

I want to change most of the form and field formatting. Using the FireFox debugger it looks like much of the formatting is in semantic.min.css. Is that a part of ChronoForms? Or is that part of the Joomla/templates?

That's a part of chronoforms.

You can just use your own custom css to override the things you want, don't edit the semantic.min.css file.