chrome-extensionInject CSS into page

{
 "name": "My",
 // ...
 "content_scripts": [
   {
     "matches": ["*://*/*"],
     "css": ["my.css"],
   }
 ],
 // ...
}ctrl + cyoutubegithub

`"name": "My"` name of the extension for `manifest.json`	`matches` on what pages should we inject css
`":///*"` inject css into all pages	`my.css` name of the css file to inject (should be placed in the same folder as `manifest.json` file)