You gain flexibility by letting your browser handle such things. Have a look at Stylus https://github.com/openstyles/stylus https://github.com/openstyles/stylus

You gain flexibility by letting your browser handle such things. Have a look at Stylus https://github.com/openstyles/stylus https://github.com/openstyles/stylus, which is a privacy-conscious fork of Stylish for Chrome, also compatible with Firefox as a WebExtension.