Setting Container Width

Hi there,

tricky one.
The custom build is using a max-width of 1600px with inline padding set to REMs.
The padding varies between 0, 1.25rem and 5rem at higher breakpoint.
The REM unit value is also variable due to this CSS:

html {
    font-size: min(1vw,16px);
}

So its complicated and replicating it in GP is not going to be 100% accurate.
For the basic containment width try:

1. set the themes Container Width to 1600px.

2. add this CSS to set the REM size and padding to match the homepage.

html {
    font-size: min(1vw,16px);
}
.grid-container {
    padding-inline: 1.25rem !important;
}
@media print,screen and (min-width:64.0625em) {
    .grid-container {
        padding-inline: 5rem !important;
    }
}

It should get you something close.

Ah theres a bunch of media breaks for the root rem size and one additional rule for serving the p size.
Update the CSS to this:

html {
    font-size: min(1vw,16px);
}
.grid-container {
    padding-inline: 1.25rem !important;
}

p {
    font-size: 1.15rem
}

@media print, screen and (max-width: 75.06125em) {
    html {
        font-size:min(1.2vw, 21.3333333333px)
    }
}

@media print, screen and (max-width: 64.06125em) {
    html {
        font-size:min(1.5vw, 21.3333333333px)
    }
}

@media screen and (max-width: 800px) {
    html {
        font-size:min(2vw, 21.3333333333px)
    }
}

@media print, screen and (max-width: 40.06125em) {
    html {
        font-size:min(4.2vw, 21.3333333333px)
    }
}