:root {
  --grey-l1: #bdbdbd; /* grey lighteen-1 */
  --grey-l2: #e0e0e0; /* grey lighteen-2 */
  --grey-l4: #f5f5f5; /* grey lighten-4 */
  --grey-d2: #616161; /* grey darken-2 */
  --grey-d3: #424242; /* grey darken-3 */
  --blue-d3: #1565c0; /* blue darken-3 */
  --blue-d1: #1e88e5; /* blue darken-1 */
  --blue-l4: #bbdefb; /* blue lighten-4 */
}