Hi salamu
As being said, you will need to change in layout of template, not in T4 Builder, I updated some files on your site by creating a new layout and load the blocks that I remove the 'container' class:
ROOT/templates/ja_healthcare/tpls/blocks/mainbody/fullwidth.php
ROOT/templates/ja_healthcare/tpls/blocks/mainbody-fullwidth.php
ROOT/templates/ja_healthcare/tpls/default-fullwidth.php
Then in backend of your site >> Template Styles >> I cloned the default template style of JA Healthcare to have a new one called: ja_healthcare - FullWidth to load the new layout created above and assign to contact page:
![](https://www.joomlart.com/forums/assets/files/2022-03-02/1646219417-864713-screen-shot-2022-03-02-at-180644.png)
![](https://www.joomlart.com/forums/assets/files/2022-03-02/1646219426-466150-screen-shot-2022-03-02-at-180720.png)
![](https://www.joomlart.com/forums/assets/files/2022-03-02/1646219434-636868-screen-shot-2022-03-02-at-180748.png)