website/assets/scss/custom.scss

@import "~bootstrap/scss/functions";
@import "~bootstrap/scss/variables";
@import "~bootstrap/scss/utilities";

$utilities: map-merge(
        $utilities,
        (
            "width":
            map-merge(
                    map-get($utilities, "width"),
                    (
                        responsive: true,
                        values: map-merge(
                                map-get(map-get($utilities, "width"), "values"),
                                (20: 20%),
                        ),
                    )
            )
        )
);