google chrome extension - Add CSS to pages through a CSS file -

I was thinking that it is possible to add css to pages via CSS file, similarly pages via JS to JS Adding to File (Symbolic) Therefore, I can only determine what the page will work on the CSS file and then it will be as effective as a subscript. I think it is possible to add css through the javascript file, but if possible it would be more convenient to do this instead. If this is not possible, then surely I have to use the material stuff, but before I deny any possibilities, first I would like to know I searched and I did not find any answer - I was looking for the wrong I am or it is not really possible. Chrome extensions have come a long way, however, unless someone knows me yes & amp; Thanks for not responding or any feedback.

Your manifest file should point to a content script a In the CSS file , when a URL matches your selected URL field ...

  "content_scripts": [{"CSS": ["scrollbars. Css "]," matches ": [" http://www.google.com/* "]}],   
 This is the only way you can replace the  js In addition to pointing to the file , you will use  javascript code  to inject ...