scss-library/components/01_Layouts/flexGrid/_flexGrid.scss

@mixin RV-FlexGrid__Container($-item_width: 300px, $-item_height: 300px) {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax($-item_width, 1fr));
    grid-template-rows: repeat(auto-fill, minmax($-item_height, 1fr));
    grid-auto-rows: minmax($-item_height, 1fr);
}

@mixin RV-FlexGrid($-item_width: 300px, $-item_height: 300px, $-prefix: '&') {
    #{$-prefix}__Container {
        @include RV-FlexGrid__Container($-item_width, $-item_height);
    }

    #{$-prefix}__Item {
        @include RV-Alignment;
    }
}

.RV-FlexGrid {
    @include RV-FlexGrid;
}