$grey-50: #FAFAFA;
$grey-100: #F5F5F5;
$grey-200: #EEEEEE;
$grey-300: #E0E0E0;
$grey-400: #BDBDBD;
$grey-500: #9E9E9E; // main
$grey-600: #757575;
$grey-700: #616161;
$grey-800: #424242;
$grey-900: #212121;

$grey-map: (
    grey-50: $grey-50,
    grey-100: $grey-100,
    grey-200: $grey-200,
    grey-300: $grey-300,
    grey-400: $grey-400,
    grey-500: $grey-500,
    grey-600: $grey-600,
    grey-700: $grey-700,
    grey-800: $grey-800,
    grey-900: $grey-900
);

$colors-map: map-merge($colors-map, $grey-map);