Why is it so hard to make my text blocks full width on the screen?

Site URL: https://corona-enterprises.com/company-story

I'm on Version 7.0– Brine family (Brine template)

Why isn't it easier to make my text blocks full screen width??

Hi. Add to Design > Custom CSS

/* Company story text width */
body#collection-594896e84f14bc5e014d6db2 section.Main-content {
    padding-left: 0;
    padding-right: 0;
    max-width: 99%;
}