columns have no background if you didn't set it. Also, you are using custom plugin which changed regular css files which can be not compatible with Elementor's custom style system

Ok thank you, but what about the white background like in my homepage : https://hdfever.fr

Ok. I found that you also didn't clean cache and didn't follow update notice 

http://rehubdocs.wpsoul.com/docs/rehub-theme/for-developers/11-7-update-of-theme/

it was fixed early. you must use actual theme version

Not all icons are displayed, example here: https://www.hdfever.fr/passerelle-multimedia-boitier#comparatif and there is normally a white background behind "notre coup de coeur : NVIDIA Shield TV". I have the impression that the column backgrounds are no longer displayed.

These bugs come from the new version.

Thanks