iFrames in sololearn don't seem to work, not really a coding question but..

Question

iFrames in SoloLearn don't seem to work, they seem to redirect.. to the actual code.sololearn.com project I'm literally working on, here's an example of my code:
https://code.sololearn.com/W29FbbGHYqDH/#css

Answer 1

This happens if the website does not allow you to access their website from iframes like Google and some other websites