Add full bleed background color/image in additional info section

Site URL: https://humbeeshop.squarespace.com/shop/hand-sanitizer-disinfectant-gel-169oz50ml-packs-of-61224

PW is 2020

Hello!
Is that possible to add a full bleed background color in one section?

I tried to use div class the CSS but it cant display a full-width background.

Add to Home > Design > Custom CSS

body#item-5eda1c790c999953b07c2141 {
  section.products.collection-content-wrapper {
      max-width: 100% !important;
      padding-left: 0 !important;
      padding-right: 0 !important;
  }
  section.ProductItem-additional .span-12>div {
      max-width: 1280px;
      padding-left: 4vw;
      padding-right: 4vw;
  }
  section.ProductItem-additional .span-12>div:nth-child(5) {
      max-width: 100%;
      background: yellow;
  }
}