Full size HomePage

Hi,
I’ve bought the theme multicorp and to make my home page i used the plug Visual composer.
That is my homepage : https://00ecb7657a.url-de-test.ws/
You see that each area : slider, bimage/text bloc, etc were not in full size. It stays of the white goshawk the bloc, why ?
I would like to have my bloc full (visual composer) like that for exemple : https://botanisara.isara.fr/ here the image in background is just a color and the image in the box are full.
Please help me !
Thank you very much