fighting with 3 problems I can't solve

[fker]

I am fighting with 3 problems.
They are certainly easy to solve for more experience people than me

The site i have built out of a free template (and appearing as a subdomain here dj.atrm-systems.fr/accueil.html).

Everything is ok but on smartphones (Samsung S 7, 8, 9 and 10)
1.- the menu does not pop up (it becomes a cross and nothing happens
2.- the background image continues on the right out of the viewport (then one can slide from right to left which should not exist.
3.- next to the bottom the "prenez rendez-vous section is unreadable because the background image does not spread long enough.

This does not exist when using chrome of edge on a computer (W10).

I do not understand what happens.
Thanks for helping me to progress with you obviously great soft.

François

[Pablo]

There is a scrollbar at the bottom of the page, this indicates that there are objects outside the viewport.
For example: Bookmark2, Caz, RDV, Installee, Adresses

See also "There is a large is empty space at the bottom or right side of my page"
http://www.wysiwygwebbuilder.com/forum/ ... 10&t=63817