MY ARTICLES ARE ALL aligned on the right of the screen

MY ARTICLES ARE ALL aligned on the right of the screen and without margins, it's not very pretty, how can I make sure there's a space please?
Could you help me please ?
LOOK PLEASE :
https://iforma.re/chef-d-entreprise-connexion-formation-continue

Here is how it looks from my end:

Could you share screenshot of how it should be?

saguaros
Hi
yes when I add a module in sidebar the article is correct but if I remove it it is all on the right
look please : https://iforma.re/chef-d-entreprise-connexion-formation-continue
Could you help me please ?

I've updated your site, kindly check and let me know if there is any issue 🙂