Hue

rainbow-trail:

{
    "50": "#f5f5f5",
    "100": "#bebebe",
    "200": "#acacac",
    "300": "#9c9c9c",
    "400": "#8b8b8b",
    "500": "#7a7a7a",
    "600": "#696969",
    "700": "#585858",
    "800": "#474747",
    "900": "#363636"
}