#21cbba

At a glance

Every number on this page in one read: what #21cbba is made of, how bright it looks, and which way it leans.

Design tokens

The same ramp in the four formats a team actually needs. Paste one and the whole palette lands with it.

:root {
  --brand-50: #F3FCFB;
  --brand-100: #E7F8F7;
  --brand-200: #C9F3EF;
  --brand-300: #9FEFE7;
  --brand-400: #6EE7DB;
  --brand-500: #3EE0CF;
  --brand-600: #21cbba;
  --brand-700: #1DAFA1;
  --brand-800: #178C81;
  --brand-900: #15665E;
  --brand-950: #0D403B;
  --brand: #21cbba;
  --brand-ink: #000000;
  --brand-surface: #F4FAFA;
  --brand-border: #C0EDE8;
  --brand-hover: #1CAC9E;
  --brand-pressed: #178E82;
}
@media (prefers-color-scheme: dark) {
  :root {
    --brand-surface: #142423;
    --brand-ink: #D3EEEB;
  }
}

theme: {
  extend: {
    colors: {
      brand: {
        50: '#F3FCFB',
        100: '#E7F8F7',
        200: '#C9F3EF',
        300: '#9FEFE7',
        400: '#6EE7DB',
        500: '#3EE0CF',
        600: '#21cbba',
        700: '#1DAFA1',
        800: '#178C81',
        900: '#15665E',
        950: '#0D403B',
        DEFAULT: '#21cbba',
      },
    },
  },
}

$brand: (
  '50': #F3FCFB,
  '100': #E7F8F7,
  '200': #C9F3EF,
  '300': #9FEFE7,
  '400': #6EE7DB,
  '500': #3EE0CF,
  '600': #21cbba,
  '700': #1DAFA1,
  '800': #178C81,
  '900': #15665E,
  '950': #0D403B,
);
$brand-base: #21cbba;
$brand-ink: #000000;

@function brand($step) { @return map-get($brand, $step); }

{
  "color": {
    "brand": {
      "50": { "$value": "#F3FCFB", "$type": "color" },
      "100": { "$value": "#E7F8F7", "$type": "color" },
      "200": { "$value": "#C9F3EF", "$type": "color" },
      "300": { "$value": "#9FEFE7", "$type": "color" },
      "400": { "$value": "#6EE7DB", "$type": "color" },
      "500": { "$value": "#3EE0CF", "$type": "color" },
      "600": { "$value": "#21cbba", "$type": "color" },
      "700": { "$value": "#1DAFA1", "$type": "color" },
      "800": { "$value": "#178C81", "$type": "color" },
      "900": { "$value": "#15665E", "$type": "color" },
      "950": { "$value": "#0D403B", "$type": "color" }
    },
    "brandInk": { "$value": "#000000", "$type": "color" }
  }
}

Best text color

Only one of black and white can be right. This is the one, with the number that proves it.

Make it accessible

A contrast checker tells you that you failed. This tells you what to ship instead — same hue, same saturation, lightness moved only as far as WCAG demands.

Accessibility — WCAG contrast

Contrast is symmetric, so each row covers both directions: #21cbba as text on that neutral, and that neutral as text on #21cbba.

Roughly one man in twelve has some form of colour vision deficiency. If any of the three panels above is hard to tell apart from a neighbouring colour in your palette, add a shape, an icon or a label so the meaning does not rest on hue alone.

Color scale — 50 to 950

A Tailwind-shaped ramp built around this exact hex. #21cbba is pinned to step 600; the rest hold its hue and let saturation ease off at the extremes so the pale end never turns neon.

:root {
  --brand-50: oklch(0.97 0.032 184.0);
  --brand-100: oklch(0.94 0.052 184.0);
  --brand-200: oklch(0.88 0.078 184.0);
  --brand-300: oklch(0.80 0.101 184.0);
  --brand-400: oklch(0.72 0.119 184.0);
  --brand-500: oklch(0.64 0.130 184.0);
  --brand-600: oklch(0.56 0.130 184.0);
  --brand-700: oklch(0.48 0.122 184.0);
  --brand-800: oklch(0.40 0.109 184.0);
  --brand-900: oklch(0.32 0.091 184.0);
  --brand-950: oklch(0.24 0.071 184.0);
}

Colors that work with #21cbba

Not a palette — a role sheet. Each swatch answers one question you will hit while building the component.

In real components

The same eight roles, wired into the interface patterns you will actually build with them. Every state below is a computed value, not a mock-up.

How to use #21cbba

Derived from its contrast, chroma and lightness — not from taste.

Meaning and mood

What a colour in this family tends to signal, and how this particular chroma and lightness change the reading.

Similar colors

One move away from this hex in each direction. Every swatch is its own page.

Color relationships

The wheel positions with their names attached, so you can grab the one you actually need.

Transparency

What each alpha value actually composites to. The top row is #21cbba over white; the bottom row is the same alpha over a checkerboard, so you can see what survives on a photo or a video.

rgba(33, 203, 186, 0.5)
rgb(33 203 186 / 50%)
#21cbba80
hsl(174 72% 46% / 50%)
color-mix(in srgb, #21cbba 50%, transparent)

Gradients from #21cbba

Six recipes, each built from this hex and shown with the exact CSS that produced it.

background: linear-gradient(135deg, #48E1D2, #21cbba 45%, #126E64);

background: linear-gradient(120deg, #21cbba, #1D51B1);

background: linear-gradient(90deg, #21cbba, #CB2132);

background: radial-gradient(120% 120% at 20% 0%, #62E6D8 0%, #21cbba 45%, #126E64 100%);

background: linear-gradient(180deg, #F4FAFA, #ffffff);

background: radial-gradient(60% 60% at 15% 20%, #3FE072 0%, transparent 60%), radial-gradient(55% 55% at 85% 15%, #2E88DD 0%, transparent 60%), radial-gradient(70% 70% at 50% 95%, #126E64 0%, transparent 65%), #21cbba;

Nearest named colors

Ranked with CIEDE2000 across all 139 CSS keywords. Under ΔE 2 the eye stops telling them apart; over ΔE 10 they are plainly different colors.

#21cbba in the real world

Where a color in this family tends to land, and the interface roles it is usually asked to play.

Explore nearby colors

Small, deliberate steps away from this hex — useful when you are hunting for the version of a colour that finally feels right.