Are there style guides that can be shared?
At Bitovi, since we use the Boostrap Framework in most of our projects we created bootdocs, which is basically documentation for the framework using DocumentJS. Bootdocs is a public repo, so that is place to start if you are using Bootstrap, but even if you are not, you can get ideas on how to organize your docs and what to include in them.
Another place to look for style guide examples is styleguides.io.
In my own experience once I create a living style guide for my project, I will typically reuse most of it on the next, so I'm always using the most up to date version.