Online screenshot service with pre-changed css and ability to use proxy?

Question

css

There are many online services to which you feed the site url (directly as a parameter in the query_string), and in response they give out a screenshot of this site. This has already been answered in Q&A.
Are there any that also allow:
1. Specify additional css styles that are applied to the page before rendering (for example, I want to highlight some element on the page with a frame before taking a screenshot).
1. Specify your proxy server through which requests to the site will go (after all, the site may be inside the local network, and there may not be access to it from the outside from the Internet - this is where the proxy will help).
Paid or free - no matter what. The main thing is that this 2 point is satisfied.

Answer 1

If there is no need for different browsers and different versions, shoot locally with IECapt / CutyCapt and replace styles via Charles .

Answer 2

You can quickly and easily deploy your screenshot service at phantomjs.org + https://github.com/goodylabs/screenshot-service , this solves the problem of accessing local sites, well, you can add CSS / JS / whatever.