PurifyCSS
Remove unused CSS. Also works with single-page apps
...If your application is using a CSS framework, this is especially useful as many selectors are often unused. Statically analyzes your code to pick up which selectors are used. The CLI currently does not support file patterns. Remove unused CSS code from your stylesheet. PurifyCSS is meant to be installed via npm and built into your build process using tools like Grunt, Gulp or Webpack. However if you're using a different development stack or building your sites with a CMS like Wordpress, you can use the online tool to clean up your stylesheet. ...