What color is #40370E?

#40370E is a very dark brown. In RGB it is rgb(64, 55, 14), and in HSL hsl(49, 64%, 15%).

Is #40370E accessible as text?

On white, #40370E has a contrast ratio of 11.86:1 (passes WCAG AA for body text); on black it is 1.77:1 (fails). For text placed on #40370E, use white for the best readability.

What is the closest Tailwind color to #40370E?

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

What colors go well with #40370E?

#40370E pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #0E173F. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #40370E below.

Is #40370E good for buttons?

#40370E works well for buttons and highlights, but use white text on #40370E — black text only reaches 1.77:1, below the 4.5:1 needed for normal-size labels.

Is #40370E the same as CSS darkslategray?

No — #40370E 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.

#40370E Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #40370E

Not just a swatch — here's how #40370E works with other colors. Named schemes with #40370E in its natural role, and a note on why the supporting colors balance it.

Warm Autumn Interior Dominant · 5 colors

Dominant #40370E Secondary #B2680F Accent #6F7A48 Surface #F3ECDD Anchor #3A2A1F

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 #40370E Secondary #784C20 Surface #E7DAC0 Accent #3F503D Anchor #5B2227

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.

Botanical Studio Lead · 5 colors

Lead #40370E Secondary #546A35 Accent #B2680F Surface #F0E9D6 Anchor #3D2E21

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

Desert Clay Center · 5 colors

Center #40370E Surface #DFCFA8 Secondary #AE7C51 Accent #919970 Anchor #3D2C1F

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

Minimal Editorial Surface · 5 colors

Surface #F7F4EF Accent #40370E Secondary #605D50 Support #999186 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 #40370E 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 62/100

Warm

Reads warm and advancing — inviting, energetic, draws the eye forward.

Softness 33/100

Low

Middle-weight — neither delicate nor heavy.

Depth 64/100

High

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

Naturalness 69/100

High

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

Vintage feel 53/100

Moderate

A faint retro warmth without tipping into sepia.

Luxury 67/100

High

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

Brand distinctiveness 23/100

Low

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

UI accent fit 40/100

Moderate

Workable accent with care around contrast.

Surface fit 45/100

Moderate

Usable as a tinted surface in measured doses.

Print safety 91/100

Very high

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #40370E

For UI

For branding

For interior

For fashion

People also use #40370E with

Espresso British Racing Green Navy 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 11.9:1. Use

Subtle surface Use #E8E0C0 for cards and hover fills. Tint 80

Avoid beside #373F0E — 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 #40370E 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: #40370E;
  --color-base-rgb: 64 55 14;
  --color-base-oklch: oklch(33.7% 0.059 96.6);
  --color-50: #FDFBF2;
  --color-100: #F8F3DD;
  --color-200: #F0E7BC;
  --color-300: #E1D28E;
  --color-400: #CEBB64;
  --color-500: #B39E42;
  --color-600: #897A39;
  --color-700: #61582E;
  --color-800: #403A21;
  --color-900: #272416;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  espresso: {
    50: '#FDFBF2',
    100: '#F8F3DD',
    200: '#F0E7BC',
    300: '#E1D28E',
    400: '#CEBB64',
    500: '#B39E42',
    600: '#897A39',
    700: '#61582E',
    800: '#403A21',
    900: '#272416',
  },
}

$base: #40370E;
$base-ink: #FFFFFF;
$base-50: #FDFBF2;
$base-100: #F8F3DD;
$base-200: #F0E7BC;
$base-300: #E1D28E;
$base-400: #CEBB64;
$base-500: #B39E42;
$base-600: #897A39;
$base-700: #61582E;
$base-800: #403A21;
$base-900: #272416;
$base-hover: #322B0B;
$base-subtle: #DED29E;

{
    "color": {
        "base": {
            "value": "#40370E",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#FDFBF2",
                "type": "color"
            },
            "100": {
                "value": "#F8F3DD",
                "type": "color"
            },
            "200": {
                "value": "#F0E7BC",
                "type": "color"
            },
            "300": {
                "value": "#E1D28E",
                "type": "color"
            },
            "400": {
                "value": "#CEBB64",
                "type": "color"
            },
            "500": {
                "value": "#B39E42",
                "type": "color"
            },
            "600": {
                "value": "#897A39",
                "type": "color"
            },
            "700": {
                "value": "#61582E",
                "type": "color"
            },
            "800": {
                "value": "#403A21",
                "type": "color"
            },
            "900": {
                "value": "#272416",
                "type": "color"
            }
        }
    }
}

Palettes built on #40370E

Color Lab

Pairs with #40370E

UI roles & guardrails

In real applications

Scales

Every model

Export