L don't understand

Due to browser implementation differences, you may need to be at 100% zoom to pass the tests on this challenge.

Also, please do not add a class attribute to your new p element.
… l don’t understand

Hi nerisss.
100% zoom means your default browser display level. You can control it with ctrl + mouse scroll or clrl+"+"/"-" which increase or decrease fonts size and pictures size in your browser.
Attribute class is something like this : <p class=“someClass”>

woowww thanks mr. yournameis arthur:))

I would be sorry gentleman.