OfficialSite/assets/styles/objects/_grid.scss

// ==========================================================================
// Grid
// ==========================================================================
@mixin grid($grid-gutter: 0) {
    margin-left: -$grid-gutter;
    letter-spacing: normal;
    font-size: 0;
}
.o-grid {
    @include grid;
}

@mixin grid_item($grid-gutter: 0) {
    display: inline-block;
    padding-left: $grid-gutter;
    width: 100%;
    vertical-align: top;
    font-size: 1rem;
}
.o-grid_item {
    @include grid_item;
}