Build a Product Landing Page / proble with links

Tell us what’s happening:

am trying to add a link to youtube video, but it’s not working.
Even, I’ve tried to add others links, even in scure mode but no success !
Help please !
Many thanks

Your code so far

Your browser information:

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:61.0) Gecko/20100101 Firefox/61.0.

Link to the challenge:

Unless you provide a link to your project, we can not see the code you have tried. Once we see your code, we can give you hints or suggestions on how to fix.

The following link is working :

But, by changing the URL :

<iframe id="video" height="315" src="></iframe> <p>it stop working</p>