What color is #00400A?

#00400A is a very dark, vivid green. In RGB it is rgb(0, 64, 10), and in HSL hsl(129, 100%, 13%).

Is #00400A accessible as text?

On white, #00400A has a contrast ratio of 12.08:1 (passes WCAG AA for body text); on black it is 1.74:1 (fails). For text placed on #00400A, use white for the best readability.

What is the closest Tailwind color to #00400A?

The nearest Tailwind CSS token is lime-950 (#192E03).

What colors go well with #00400A?

#00400A pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #420038. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #00400A below.

Is #00400A good for buttons?

#00400A works well for buttons and highlights, but use white text on #00400A — black text only reaches 1.74:1, below the 4.5:1 needed for normal-size labels.

Is #00400A the same as CSS darkslategray?

No — #00400A is not the CSS named color darkslategray, but darkslategray (#2F4F4F) is the closest CSS named color by perceptual color distance — it sits in a different color family, so treat it as a rough reference, not a match.

#00400A Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #00400A

Not just a swatch — here's how #00400A works with other colors. Named schemes with #00400A in its natural role, and a note on why the supporting colors balance it.

Botanical Studio Lead · 5 colors

Lead #00400A Secondary #4C6B3B Accent #AD6B00 Surface #EEEAD6 Anchor #3C2F20

British Racing Green leads this botanical set among foliage greens and a terracotta accent, softened by cream and grounded in bark brown.

Luxury Packaging Feature · 5 colors

Feature #00400A Anchor #141210 Accent #C0A64B Secondary #232C23 Surface #F1EDE3

British Racing Green carries the depth in this luxury scheme, offset by a brass accent and near-black and held together by a deep neutral and an off-white surface.

Moody Editorial Color · 5 colors

Color #00400A Anchor #292A2E Secondary #6C6F74 Surface #EBE6DA Accent #00200C

British Racing Green adds the colour to this moody editorial scheme — charcoal and a mid-grey around it, a bone highlight, and a muted jewel accent drawn from British Racing Green.

Vintage Leather Lead · 5 colors

Lead #00400A Secondary #754E1B Surface #E6DBC0 Accent #3C5140 Anchor #5B2322

British Racing Green plays the worn-leather lead, deepened by saddle brown and an oxblood anchor, softened by aged cream and cooled by a muted forest green.

Minimal Editorial Surface · 5 colors

Surface #F7F4EF Accent #00400A Secondary #4D5E4C Support #989286 Ink #17140F

British Racing Green is the single accent in this high-contrast editorial system — set on near-white paper against near-black ink, with a warm grey and a desaturated tint of British Racing Green carrying the quiet middle.

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Color Lab

How #00400A actually behaves in design work — read from its OKLCH lightness, chroma and hue, not just its raw numbers. Ten signals to help you decide where this color earns its place.

Warmth 48/100

Neutral

Balanced temperature — flexible, sits between warm and cool schemes.

Softness 29/100

Low

Firm and assertive — carries weight and contrast.

Depth 68/100

High

Deep and grounding — anchors a layout, strong dark-mode base.

Naturalness 100/100

Very high

Organic, earthy character — at home in wellness, food and craft brands.

Vintage feel 48/100

Moderate

A faint retro warmth without tipping into sepia.

Luxury 72/100

High

Restrained and premium — deep, quiet, high-end packaging and fashion.

Brand distinctiveness 40/100

Low

Recognisable but shares space with nearby hues.

UI accent fit 45/100

Moderate

Workable accent with care around contrast.

Surface fit 33/100

Low

Usable as a tinted surface in measured doses.

Print safety 77/100

High

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #00400A

For UI

For branding

For interior

For fashion

People also use #00400A with

Dark Green British Racing Green Deep Purple Platinum Hunter Green

UI roles & guardrails

Primary action Safe as a filled button with white label. AAA

Body text Passes on white at 16px and above. Pass

Large display Fine for headings 24px+ on white. Pass

Background Pair with white text at 12.1:1. Use

Subtle surface Use #B3F3BC for cards and hover fills. Tint 80

Avoid beside #004220 — the hue gap is too small to read as intentional. Clash

In real applications

Not a swatch to memorise — a color to build with. Here is #00400A at work across the surfaces designers actually ship.

Website / UI

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Dashboard

Revenue

$48.2k ▲ 12%

Brand

AVELINE

Studio

Poster

Nov 14 · 8PM

NIGHT
MARKET

Packaging

BLOOM

Botanical Wash

250 ml

Interior

Every model

Export

:root {
  --color-base: #00400A;
  --color-base-rgb: 0 64 10;
  --color-base-oklch: oklch(32.3% 0.102 144.7);
  --color-50: #F0FEF2;
  --color-100: #D8FDDD;
  --color-200: #B1FCBC;
  --color-300: #77F88A;
  --color-400: #46EC5F;
  --color-500: #22D23D;
  --color-600: #239F35;
  --color-700: #1F702B;
  --color-800: #184820;
  --color-900: #112C15;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  british-racing-green: {
    50: '#F0FEF2',
    100: '#D8FDDD',
    200: '#B1FCBC',
    300: '#77F88A',
    400: '#46EC5F',
    500: '#22D23D',
    600: '#239F35',
    700: '#1F702B',
    800: '#184820',
    900: '#112C15',
  },
}

$base: #00400A;
$base-ink: #FFFFFF;
$base-50: #F0FEF2;
$base-100: #D8FDDD;
$base-200: #B1FCBC;
$base-300: #77F88A;
$base-400: #46EC5F;
$base-500: #22D23D;
$base-600: #239F35;
$base-700: #1F702B;
$base-800: #184820;
$base-900: #112C15;
$base-hover: #003508;
$base-subtle: #8AEF99;

{
    "color": {
        "base": {
            "value": "#00400A",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F0FEF2",
                "type": "color"
            },
            "100": {
                "value": "#D8FDDD",
                "type": "color"
            },
            "200": {
                "value": "#B1FCBC",
                "type": "color"
            },
            "300": {
                "value": "#77F88A",
                "type": "color"
            },
            "400": {
                "value": "#46EC5F",
                "type": "color"
            },
            "500": {
                "value": "#22D23D",
                "type": "color"
            },
            "600": {
                "value": "#239F35",
                "type": "color"
            },
            "700": {
                "value": "#1F702B",
                "type": "color"
            },
            "800": {
                "value": "#184820",
                "type": "color"
            },
            "900": {
                "value": "#112C15",
                "type": "color"
            }
        }
    }
}

Palettes built on #00400A

Color Lab

Pairs with #00400A

UI roles & guardrails

In real applications

Scales

Every model

Export