def generate_grid_css
      # loads up erb template to evaluate custom widths
      css = ERB::new(File.path_to_string(CustomLayout::CSS_ERB_FILE))
    
      # bind it to this instance
      css.result(binding)
    end
def generate_grid_css
      # loads up erb template to evaluate custom widths
      css = ERB::new(File.path_to_string(CustomLayout::CSS_ERB_FILE))
    
      # bind it to this instance
      css.result(binding)
    end
Loads grid.css.erb file, binds it to current instance, and returns output