When I try to launch this page so I can fork this CodePen:
I get a “404: Page Not Found” error.
Your browser information:
User Agent is:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.3396.99 Safari/537.36.
Link to the challenge:
The link above is not a codepen link. That js lib is for testing your page against user stories.
you have to go to the code pen and write your code ,after that it will work waiting your response .
the correct link is