Hey @lcleblan,
Thanks for joining the Community.
I apologize for the delay and appreciate your patience. Our ECOM team has confirmed there is no way to modify the margins of the mobile site at this time.
It looks like you're using a responsive theme you have modified through the theme editor with a custom code.
Responsive themes optimize websites for viewing on all screen sizes, whereas non-responsive themes keep website dimensions static. This means that your responsiveness functions to adjust several aspects of a website (e.g. background images, text size, content placement, etc.) to make sure it still looks great regardless of the visitor’s screen size.
I hope this information helps. Please let me know if I can help with anything else.
