title: Animating react-transition-group with ReactDOM createPortal
body: <p>I have been breaking my head trying to figure out how to accomplish something that I figured would be quite simple (I know...)</p>
  
  <p>Goal is for a very <em>minimal</em>, and <em>reusable</em> modal component that I can animate in some sort of HOC with a trigger button or w/e.</p>
  
  <p>I am creating it using createPortal, and the goal is to have some simple animations be added to on enter/<strong>exit</strong> of said portal.</p>
  
  <p>I have gotten this to work using GSAP, but ideally I would love for this to go along with SC instead so that I don't have to pull in another animation library.</p>
  
  <p>For the life of me I just cannot get this to work with SC and would love if someone could point me in the right direction.</p>
  
  <p>I have made a sandbox here: <a href="https://codesandbox.io/s/r44w9m4o5p" rel="noreferrer">https://codesandbox.io/s/r44w9m4o5p</a> using GSAP to run the animations, and it's a bit hacky but it is in the proper direction for what I am going for.</p>
  
  <p>Also, is there a benefit to using react-transition-group over something like <a href="https://github.com/react-tools/react-move" rel="noreferrer">https://github.com/react-tools/react-move</a>?</p>