Google Drive web hosting is now out of date.
This applies to both CSS and JS, and no matter what link format you use (host, identifier, view, etc.).
Any CSS or JS that you have in Google Drive associated with a website will no longer work (even if it was configured and working - before it happened).
For example (I tested it myself again), CSS does not load, and after checking your site you will see that the link to the device on which your file should be included returns 404 .
In Google’s own words:
Starting August 31, 2015 , Google Drive web hosting for users and developers will be out of date .
You can continue to use this feature for one year until August 31, 2016 , when we stop displaying the content via googledrive.com/host/[doc id].
Source: gsuite-developers.googleblog.com
Recommended link (from the page above): https://cloud.google.com/storage/