Function grid_css

pub fn grid_css(
    min_cell_width: Option<&str>,
    min_cols: Option<&str>,
    max_cols: Option<&str>,
    gap: Option<&str>,
    gap_x: Option<&str>,
    gap_y: Option<&str>,
    harmonic_ratio: f64,
    set: &mut HashSet<String>,
)