What color is #40331B?

#40331B is a dark brown. In RGB it is rgb(64, 51, 27), and in HSL hsl(39, 41%, 18%).

Is #40331B accessible as text?

On white, #40331B has a contrast ratio of 12.30:1 (passes WCAG AA for body text); on black it is 1.71:1 (fails). For text placed on #40331B, use white for the best readability.

What is the closest Tailwind color to #40331B?

The nearest Tailwind CSS token is taupe-700 (#473C39).

What colors go well with #40331B?

#40331B pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #1B2841. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #40331B below.

Is #40331B good for buttons?

#40331B works well for buttons and highlights, but use white text on #40331B — black text only reaches 1.71:1, below the 4.5:1 needed for normal-size labels.

Is #40331B the same as CSS darkslategray?

No — #40331B 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.

#40331B Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #40331B

Not just a swatch — here's how #40331B works with other colors. Named schemes with #40331B in its natural role, and a note on why the supporting colors balance it.

Warm Autumn Interior Dominant · 5 colors

Dominant #40331B Secondary #B36715 Accent #717946 Surface #F3ECDD Anchor #3B2A1F

This palette keeps Espresso as the dominant warm neutral, balanced by muted terracotta and olive earth tones and grounded by a deep espresso anchor.

Vintage Leather Lead · 5 colors

Lead #40331B Secondary #794B21 Surface #E8DAC0 Accent #40503D Anchor #5B2228

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

Desert Clay Center · 5 colors

Center #40331B Surface #E0CFA8 Secondary #AF7B53 Accent #929970 Anchor #3E2C1F

Espresso holds the warm center of this desert palette with sand and clay beside it, a muted-sage accent and a dark-brown anchor.

Japanese Sand Base · 5 colors

Base #40331B Surface #EFE9DC Highlight #F6F1E7 Secondary #B9AF9F Ink #2B2723

Espresso sets a calm, sun-bleached base here, wrapped in bone and paper off-whites and a soft greige, with a single ink accent for wabi-sabi restraint.

Minimal Editorial Surface · 5 colors

Surface #F7F4EF Accent #40331B Secondary #5F5A51 Support #9A9186 Ink #17140F

Espresso 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 Espresso carrying the quiet middle.

Build a working theme in the generator →

Color Lab

How #40331B 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 61/100

Neutral

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

Softness 34/100

Low

Middle-weight — neither delicate nor heavy.

Depth 64/100

High

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

Naturalness 60/100

Moderate

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 66/100

High

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

Brand distinctiveness 16/100

Very low

Quiet and neutral — a supporting tone, not a signature.

UI accent fit 34/100

Low

Workable accent with care around contrast.

Surface fit 51/100

Moderate

Usable as a tinted surface in measured doses.

Print safety 94/100

Very high

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #40331B

For UI

For branding

For interior

For fashion

People also use #40331B with

Espresso Prussian Blue Greige Army 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 12.3:1. Use

Subtle surface Use #E2D9C9 for cards and hover fills. Tint 80

Avoid beside #41401B — 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 #40331B 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: #40331B;
  --color-base-rgb: 64 51 27;
  --color-base-oklch: oklch(32.9% 0.042 81.8);
  --color-50: #FBF8F4;
  --color-100: #F3EDE2;
  --color-200: #E7DBC6;
  --color-300: #D2C09D;
  --color-400: #BBA377;
  --color-500: #9E8556;
  --color-600: #7A6947;
  --color-700: #584C37;
  --color-800: #3A3327;
  --color-900: #242019;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  espresso: {
    50: '#FBF8F4',
    100: '#F3EDE2',
    200: '#E7DBC6',
    300: '#D2C09D',
    400: '#BBA377',
    500: '#9E8556',
    600: '#7A6947',
    700: '#584C37',
    800: '#3A3327',
    900: '#242019',
  },
}

$base: #40331B;
$base-ink: #FFFFFF;
$base-50: #FBF8F4;
$base-100: #F3EDE2;
$base-200: #E7DBC6;
$base-300: #D2C09D;
$base-400: #BBA377;
$base-500: #9E8556;
$base-600: #7A6947;
$base-700: #584C37;
$base-800: #3A3327;
$base-900: #242019;
$base-hover: #342916;
$base-subtle: #D4C6AD;

{
    "color": {
        "base": {
            "value": "#40331B",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#FBF8F4",
                "type": "color"
            },
            "100": {
                "value": "#F3EDE2",
                "type": "color"
            },
            "200": {
                "value": "#E7DBC6",
                "type": "color"
            },
            "300": {
                "value": "#D2C09D",
                "type": "color"
            },
            "400": {
                "value": "#BBA377",
                "type": "color"
            },
            "500": {
                "value": "#9E8556",
                "type": "color"
            },
            "600": {
                "value": "#7A6947",
                "type": "color"
            },
            "700": {
                "value": "#584C37",
                "type": "color"
            },
            "800": {
                "value": "#3A3327",
                "type": "color"
            },
            "900": {
                "value": "#242019",
                "type": "color"
            }
        }
    }
}

Palettes built on #40331B

Color Lab

Pairs with #40331B

UI roles & guardrails

In real applications

Scales

Every model

Export