barebones/assets/styles/base/_grid.scss

.grid {
    display: grid;
    grid-gap: $base-spacing-unit;
    @include resp-max($breakpoint-sm) {
        grid-gap: $base-spacing-unit * 0.5;
    }
    
    @each $breakpoint in $breakpoints {
        $name: nth($breakpoint, 1);
        $declaration: nth($breakpoint, 2);
    
        @media only screen and #{$declaration} {
            @for $i from 1 through 6 {
                &.grid--#{$name}-#{$i}x {
                    grid-template-columns: repeat(#{$i}, minmax(0, 1fr));
                }
            }
        }
    }
}