title: conditional css in create-react-app
body: <p>I have default css file and separate css file that should be applied (to owerride default) only when certain conditions are met. </p>
  
  <p>I am using create-react-app wit default <code>import 'file.css'</code> syntax. </p>
  
  <p>What is the best way forward to decide whether to load or not load particular css file dynamically? </p>