gistfile1.js

var PanelList = React.createClass({

  // lots of stuff that front-end engineer is working on

  render: function() {
    
    // ...
    
    return (
      <div>
        <PanelA />
        <PanelB />
        <PanelC />
      </div>
    ); // Designer can make change to the render function instead of doing some hacky CSS to change it
  }
});