Hi @DanieleErcoli243 and welcome to the community.
Please can you post all your code into the template or into a new forum post.
When you enter a code block into a forum post, please precede it with a separate line of three backticks and follow it with a separate line of three backticks to make it easier to read.
You can also use the “preformatted text” tool in the editor (</>) to add backticks around text.
See this post to find the backtick on your keyboard.
Note: Backticks (`) are not single quotes (').
Please can you also link to the challenge you are doing. You can do this in the template.
I’ve also changed the category of your request to HTML/CSS