CMS How to reduce the outer margins of the cms page?

[محروم.كوم]

How do I reduce the outer margins of the cms page in the best way? The margin to the left and right of the content on the page are way too big. I would like to set the margins to be about the same size as on the Forum and Group pages.


Where can I set this? In the CSS? In the grid settings? Templates? __DEFINE_LIKE_SHARE__