Sections and Custom Page Template

Sections simply adds the CSS I gave you above to make the page content full width (https://generatepress.com/forums/topic/sections-and-custom-page-template/#post-216185), then adds containers around each section (https://generatepress.com/forums/topic/sections-and-custom-page-template/#post-216382) - either fixed or fluid depending on your settings.

It is working now, Tom thank you for such a great support! :)

<div class="background-color-class-here">
<div class="grid-container background-color-class-here">content here
</div></div>

.grid-container.container {
    max-width:100%;
}

Glad I could help :)