Full screen option on mobile devices not working

Hi.
Can you help me with the following issue? I have set up all modules to full screen size. On big screens it's ok, the modules are 100% width but on mobile devices they are not. You can still see whole page background on the sides and modules (see attached file) ale still looking like box versions and not full screen when obviously I want the modules to cover the background.
So how to make it work? What am I missing?
Here is the live url of site: houseofbeauty.atthost24.pl/

Thank you!

Hello,
in mobile view the fullscreen is not possibl.
Otherwise the content would be cutted. In mobile you need a little bit space on th right and left.