Thanks for all the explanations !
For the last question about mouse over behavior, I already tried what you said, but doing so, it will still show a mouse over title on Desktop , which I don't want. Any idea ?
Thanks again !
Also, with browser-height for row height in mobile , the elements have some position problem.
Check this out on mobile : https://www.jeremypiret.com/category/test/. my 10/11 and 11/11 are supposed to be on the same place, but they aren't. I don't understand why.