Hello Mila!
I have found that the problem is caused by the Elementor’s Divider element
which is placed above Title “MES PROGRAMMES BODY’N MIND”
This element has a fixed width of 635 px. My advice to you is to edit this element and assign it a percentage width instead of the fixed width.
Or you can add the following code into Customizing->General-Additional CSS:
@media only screen and (max-width: 636px) {
.elementor-1284 .elementor-element.elementor-element-4c85aec9 .elementor-divider-separator {
width: 100%!important;
}
#footer-wrapper .container {
width: 100% !important;
}
}
Regards