#1d233f

At a glance

Every number on this page in one read: what #1d233f 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: #F5F6FA;
  --brand-100: #EBEDF4;
  --brand-200: #D3D7E9;
  --brand-300: #B2B9DC;
  --brand-400: #8C97CA;
  --brand-500: #6574B8;
  --brand-600: #4D5DA8;
  --brand-700: #404E8C;
  --brand-800: #333E70;
  --brand-900: #283052;
  --brand-950: #1d233f;
  --brand: #1d233f;
  --brand-ink: #ffffff;
  --brand-surface: #F5F6FA;
  --brand-border: #C7CCE5;
  --brand-hover: #121526;
  --brand-pressed: #06080E;
}
@media (prefers-color-scheme: dark) {
  :root {
    --brand-surface: #141724;
    --brand-ink: #D5D9EC;
  }
}

theme: {
  extend: {
    colors: {
      brand: {
        50: '#F5F6FA',
        100: '#EBEDF4',
        200: '#D3D7E9',
        300: '#B2B9DC',
        400: '#8C97CA',
        500: '#6574B8',
        600: '#4D5DA8',
        700: '#404E8C',
        800: '#333E70',
        900: '#283052',
        950: '#1d233f',
        DEFAULT: '#1d233f',
      },
    },
  },
}

$brand: (
  '50': #F5F6FA,
  '100': #EBEDF4,
  '200': #D3D7E9,
  '300': #B2B9DC,
  '400': #8C97CA,
  '500': #6574B8,
  '600': #4D5DA8,
  '700': #404E8C,
  '800': #333E70,
  '900': #283052,
  '950': #1d233f,
);
$brand-base: #1d233f;
$brand-ink: #ffffff;

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

{
  "color": {
    "brand": {
      "50": { "$value": "#F5F6FA", "$type": "color" },
      "100": { "$value": "#EBEDF4", "$type": "color" },
      "200": { "$value": "#D3D7E9", "$type": "color" },
      "300": { "$value": "#B2B9DC", "$type": "color" },
      "400": { "$value": "#8C97CA", "$type": "color" },
      "500": { "$value": "#6574B8", "$type": "color" },
      "600": { "$value": "#4D5DA8", "$type": "color" },
      "700": { "$value": "#404E8C", "$type": "color" },
      "800": { "$value": "#333E70", "$type": "color" },
      "900": { "$value": "#283052", "$type": "color" },
      "950": { "$value": "#1d233f", "$type": "color" }
    },
    "brandInk": { "$value": "#ffffff", "$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: #1d233f as text on that neutral, and that neutral as text on #1d233f.

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. #1d233f is pinned to step 950; 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 0.013 273.1);
  --brand-100: oklch(0.94 0.021 273.1);
  --brand-200: oklch(0.88 0.032 273.1);
  --brand-300: oklch(0.80 0.041 273.1);
  --brand-400: oklch(0.72 0.049 273.1);
  --brand-500: oklch(0.64 0.053 273.1);
  --brand-600: oklch(0.56 0.053 273.1);
  --brand-700: oklch(0.48 0.050 273.1);
  --brand-800: oklch(0.40 0.045 273.1);
  --brand-900: oklch(0.32 0.037 273.1);
  --brand-950: oklch(0.24 0.029 273.1);
}

Colors that work with #1d233f

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 #1d233f

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 #1d233f 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(29, 35, 63, 0.5)
rgb(29 35 63 / 50%)
#1d233f80
hsl(229 37% 18% / 50%)
color-mix(in srgb, #1d233f 50%, transparent)

Gradients from #1d233f

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

background: linear-gradient(135deg, #303A69, #1d233f 45%, #283057);

background: linear-gradient(120deg, #1d233f, #20132A);

background: linear-gradient(90deg, #1d233f, #3F391D);

background: radial-gradient(120% 120% at 20% 0%, #3A467E 0%, #1d233f 45%, #283057 100%);

background: linear-gradient(180deg, #F5F6FA, #ffffff);

background: radial-gradient(60% 60% at 15% 20%, #2D5562 0%, transparent 60%), radial-gradient(55% 55% at 85% 15%, #392754 0%, transparent 60%), radial-gradient(70% 70% at 50% 95%, #283057 0%, transparent 65%), #1d233f;

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.

#1d233f 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.