What color is #A51B1B?

#A51B1B is a dark, vivid brown. In RGB it is rgb(165, 27, 27), and in HSL hsl(0, 72%, 38%).

Is #A51B1B accessible as text?

On white, #A51B1B has a contrast ratio of 7.57:1 (passes WCAG AA for body text); on black it is 2.77:1 (fails). For text placed on #A51B1B, use white for the best readability.

What is the closest Tailwind color to #A51B1B?

The nearest Tailwind CSS token is red-800 (#9F0712).

What colors go well with #A51B1B?

#A51B1B pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #1BA7A7. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #A51B1B below.

Is #A51B1B good for buttons?

#A51B1B works well for buttons and highlights, but use white text on #A51B1B — black text only reaches 2.77:1, below the 4.5:1 needed for normal-size labels.

Is #A51B1B the same as CSS brown?

No — #A51B1B is not the CSS named color brown, but brown (#A52A2A) is the closest CSS named color.

#A51B1B Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #A51B1B

Not just a swatch — here's how #A51B1B works with other colors. Named schemes with #A51B1B in its natural role, and a note on why the supporting colors balance it.

Warm Autumn Interior Dominant · 5 colors

Dominant #A51B1B Secondary #B76326 Accent #787743 Surface #F4EBDD Anchor #3B2A21

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

Modern Café Dominant · 5 colors

Dominant #A51B1B Anchor #3A2A21 Surface #F0E2D0 Accent #969664 Secondary #3C3833

Firebrick anchors this café scheme as the warm mid-tone, lifted by latte cream and a muted sage accent and grounded by espresso brown and a warm charcoal.

Vintage Leather Lead · 5 colors

Lead #A51B1B Secondary #7B4927 Surface #EAD9C0 Accent #43503A Anchor #5A222E

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

Berry & Cream Lead · 5 colors

Lead #A51B1B Surface #F3E6D6 Anchor #5F2037 Accent #E6C2C1 Secondary #332B2E

Firebrick sits between cream and a deep berry here, softened by a blush accent and grounded by charcoal.

Minimal Editorial Surface · 5 colors

Surface #F7F4EF Accent #A51B1B Secondary #A4756F Support #9B9186 Ink #17140F

Firebrick 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 Firebrick carrying the quiet middle.

Build a working theme in the generator →

Color Lab

How #A51B1B 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 96/100

Warm

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

Softness 33/100

Low

Middle-weight — neither delicate nor heavy.

Depth 56/100

Moderate

Mid depth — usable as an accent or a muted ground.

Naturalness 56/100

Moderate

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

Vintage feel 47/100

Moderate

A faint retro warmth without tipping into sepia.

Luxury 56/100

Moderate

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

Brand distinctiveness 47/100

Moderate

Recognisable but shares space with nearby hues.

UI accent fit 89/100

Very high

Strong interactive accent — visible and can carry a legible label.

Surface fit 10/100

Very low

Too saturated or mid-toned for big areas — keep it to accents.

Print safety 81/100

Very high

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #A51B1B

For UI

For branding

For interior

For fashion

People also use #A51B1B with

Medium Violet Red Ginger Persian Green Gainsboro Espresso

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 7.6:1. Use

Subtle surface Use #F0CFCF for cards and hover fills. Tint 80

Avoid beside #A74A1B — 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 #A51B1B at work across the surfaces designers actually ship.

Website / UI

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Build faster.

A working theme, generated in seconds.

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: #A51B1B;
  --color-base-rgb: 165 27 27;
  --color-base-oklch: oklch(46.7% 0.173 27.2);
  --color-50: #FDF1F1;
  --color-100: #FADBDB;
  --color-200: #F3B9B9;
  --color-300: #E68989;
  --color-400: #D55D5D;
  --color-500: #BA3B3B;
  --color-600: #8E3434;
  --color-700: #642A2A;
  --color-800: #421F1F;
  --color-900: #281515;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  firebrick: {
    50: '#FDF1F1',
    100: '#FADBDB',
    200: '#F3B9B9',
    300: '#E68989',
    400: '#D55D5D',
    500: '#BA3B3B',
    600: '#8E3434',
    700: '#642A2A',
    800: '#421F1F',
    900: '#281515',
  },
}

$base: #A51B1B;
$base-ink: #FFFFFF;
$base-50: #FDF1F1;
$base-100: #FADBDB;
$base-200: #F3B9B9;
$base-300: #E68989;
$base-400: #D55D5D;
$base-500: #BA3B3B;
$base-600: #8E3434;
$base-700: #642A2A;
$base-800: #421F1F;
$base-900: #281515;
$base-hover: #851616;
$base-subtle: #EAB6B6;

{
    "color": {
        "base": {
            "value": "#A51B1B",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#FDF1F1",
                "type": "color"
            },
            "100": {
                "value": "#FADBDB",
                "type": "color"
            },
            "200": {
                "value": "#F3B9B9",
                "type": "color"
            },
            "300": {
                "value": "#E68989",
                "type": "color"
            },
            "400": {
                "value": "#D55D5D",
                "type": "color"
            },
            "500": {
                "value": "#BA3B3B",
                "type": "color"
            },
            "600": {
                "value": "#8E3434",
                "type": "color"
            },
            "700": {
                "value": "#642A2A",
                "type": "color"
            },
            "800": {
                "value": "#421F1F",
                "type": "color"
            },
            "900": {
                "value": "#281515",
                "type": "color"
            }
        }
    }
}

Palettes built on #A51B1B

Color Lab

Pairs with #A51B1B

UI roles & guardrails

In real applications

Scales

Every model

Export