For example: The :root selector matches the document's root element. Custom properties are solely for use by authors and users; CSS will never give them a meaning beyond what is presented here. Need help with JavaScript and CSS not working with HTML. It’s important to remember that your DOCUMENT_ROOT should work in most cases, but that it may not be a valid file system path. 14 comments Milestone. It is supported by all other browser but in IE 9+ I am not able to apply background image to css. Storybook has already a css rules that puts all the css to the