Hey @Rossella_Mascia It helps to help you if you wrap your code snippets with three backticks on a separate line before and after the code block. Thank you.
If you klick on the edit icon, you can see how it should look like.
I have another problem
Uncaught Error: Bootstrap’s JavaScript requires at least jQuery v1.9.1 but less than v4.0.0 index.js:34
at index.js:34
at index.js:21
at bootstrap.js:9
at bootstrap.js:10
Edit: Oh, you are even loading multiple jQuery versions…
Honestly (if I may say so), that code requires a solid clean up, with all that stuff loaded just anywhere, style tags in the body instead of in the head where they belong, all these inline styles etc.