# Insert CSS Sample that shows how to inject CSS into a [webview](http://developer.chrome.com/apps/app_external.html#webview). The user can adjust the regular expression used to match URLs for injection, and adjust the injected CSS itself. Navigation is only supported through following links within the webview. ## Resources * [Webview](http://developer.chrome.com/apps/app_external.html#webview) * [Permissions](http://developer.chrome.com/apps/manifest.html#permissions) ## Screenshot