the article must take all the width

https://prnt.sc/_LC2OpO7GDGz
Hi I would like my article
appear in full page
it must occupy all the space of the screen
Could you help me please ?
like my website concurrent model : https://www.studi.com/fr/formation/commerce-international/bachelor-commerce-international-0

I'm not familiar with native language on your site, could you share URL of that page?

You can see my example article that I want to apply to all my articles: http://iforma.re/index.php/formations/alternance/assistant-e-de-direction

I got it, in layout of this template, it's bounded by a container. If you want it shows fully, you can edit file:

root/templates/uber/tpls/blocks/mainbody/no-sidebar.php

Line 15:

<div id="t3-mainbody" class="container t3-mainbody">

change it to:

<div id="t3-mainbody" class="t3-mainbody">

THANK ALL IS OK