reactJS in codepen.io

I want to learn reactJs but i am unable to set up the environment in codepen.io

please help
here’s the link: http://codepen.io/romit016/pen/akRAzz?editors=0010

But isn’t easier to develop in a decent code editor like atom?

why am I not getting any output on codepen.io

I’ve included babel and react in my project already

You forgot to add this: ReactDOM.render(<HelloWorld />, document.body);

Don’t bother with Codepen once you get this far in the course. Learn to code locally on your computer. It works better and you’ll be learning how to code like you would in a real world project learning and refining a good workflow and the associated tools you’ll be needing to learn.

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