Thanks a lot for your quick feedback !
The method indeed placed me on the right track. I still had to add an offset to the carousel element as per some particularities of my page. Here is the final :)
https://arnaudcordel.fr/prismes/
https://arnaudcordel.fr/matter-of-matter/
Little feedback before closing.. I noticed what could be a little bug on the "Site Title". My text format created for this element have the "Full Cap" transform option. But it is not written in full cap on the site's settings. So i get it classical in Google but in full cap on my website. It does get full cap on desktop, but fails on mobile were the text style transformation doesn't apply. Maybe something to fix, or it is an issue on my side ?
Thanks a lot,
A.