Google Chrome Custom Stylesheet Locations Revision as of Sunday, 27 December 2015 at 07:27 UTC

OS X

~/Library/Application Support/Google/Chrome/Default/User StyleSheets/Custom.css

Windows

C:\Users\<your-userid>\AppData\Local\Google\Chrome\User Data\Default\User StyleSheets\

Linux

~/.config/google-chrome/Default/User StyleSheets