$blue-grey: (
  'base': #607d8b,
  'lighten-5': #eceff1,
  'lighten-4': #cfd8dc,
  'lighten-3': #b0bec5,
  'lighten-2': #90a4ae,
  'lighten-1': #78909c,
  'darken-1': #546e7a,
  'darken-2': #455a64,
  'darken-3': #37474f,
  'darken-4': #263238
);

$grey: (
  'base': #9e9e9e,
  'lighten-5': #fafafa,
  'lighten-4': #f7f7f7,
  'lighten-3': #eee,
  'lighten-2': #e0e0e0,
  'lighten-1': #bdbdbd,
  'darken-1': #757575,
  'darken-2': #616161,
  'darken-3': #424242,
  'darken-4': #212121
);

$shades: (
  'black': #000,
  'white': #FFF,
  'transparent': transparent
);

$colors: (
  'blue-grey': $blue-grey,
  'grey': $grey,
  'shades': $shades
);