.#{$block-name-layout}__row {
    @at-root &--wrap {
        flex-wrap: wrap;
    }

    // Remove all column gutters from this row.
    @at-root &--gapless {
        margin-left: 0;
        margin-right: 0;

        .#{$block-name-layout}__column {
            padding: 0;
        }
    }
}

.#{$block-name-layout}__row {
    @at-root &--wrap {
        flex-wrap: wrap;
    }

    // Remove all column gutters from this row.
    @at-root &--gapless {
        margin-left: 0;
        margin-right: 0;

        .#{$block-name-layout}__column {
            padding: 0;
        }
    }

    // Remove only the bottom gutters from this row.
    @include modifier('bottomless') {
        margin-bottom: -$gutter-width * 2;
    }
}

Add bottomless modifier to row.
Add bottomless modifier to row.
