< a target="_blank" href=“en.wikipedia.org/?curid=48338”>Butterflies< /a>
This link is working, but leading to https://codepen.io/vladyslavnes/debug/YxeWJq/en.wikipedia.org?curid=48338.
How to deal with it?
You need http://
or https://
in front of your link.
I would recommend you to use sublime text editor, because codepen sometimes give you hard time.