What color is #045018?

#045018 is a very dark, vivid green. In RGB it is rgb(4, 80, 24), and in HSL hsl(136, 90%, 16%).

Is #045018 accessible as text?

On white, #045018 has a contrast ratio of 9.70:1 (passes WCAG AA for body text); on black it is 2.17:1 (fails). For text placed on #045018, use white for the best readability.

What is the closest Tailwind color to #045018?

The nearest Tailwind CSS token is green-900 (#0D542B).

What colors go well with #045018?

#045018 pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #4E043A. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #045018 below.

Is #045018 good for buttons?

#045018 works well for buttons and highlights, but use white text on #045018 — black text only reaches 2.17:1, below the 4.5:1 needed for normal-size labels.

Is #045018 the same as CSS darkgreen?

No — #045018 is not the CSS named color darkgreen, but darkgreen (#006400) is the closest CSS named color.

#045018 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #045018

Not just a swatch — here's how #045018 works with other colors. Named schemes with #045018 in its natural role, and a note on why the supporting colors balance it.

Luxury Packaging Feature · 5 colors

Feature #045018 Anchor #141210 Accent #C0A64B Secondary #232C23 Surface #F1EDE3

Castleton 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.

Botanical Studio Lead · 5 colors

Lead #045018 Secondary #4C6B3C Accent #AD6C00 Surface #EEEAD6 Anchor #3C2F20

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

Moody Editorial Color · 5 colors

Color #045018 Anchor #292A2E Secondary #6C6F74 Surface #EBE6DA Accent #002E19

Castleton 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 Castleton Green.

Vintage Leather Lead · 5 colors

Lead #045018 Secondary #754E1B Surface #E6DBC0 Accent #3C5140 Anchor #5B2322

Castleton 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 #045018 Secondary #5A6E5B Support #989286 Ink #17140F

Castleton 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 Castleton Green carrying the quiet middle.

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Color Lab

How #045018 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 46/100

Neutral

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

Softness 32/100

Low

Middle-weight — neither delicate nor heavy.

Depth 63/100

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 51/100

Moderate

A faint retro warmth without tipping into sepia.

Luxury 69/100

High

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

Brand distinctiveness 43/100

Moderate

Recognisable but shares space with nearby hues.

UI accent fit 64/100

High

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

Surface fit 27/100

Low

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

Print safety 76/100

High

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #045018

For UI

For branding

For interior

For fashion

People also use #045018 with

Green Brunswick 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 9.7:1. Use

Subtle surface Use #B8F0C7 for cards and hover fills. Tint 80

Avoid beside #044E30 — 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 #045018 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: #045018;
  --color-base-rgb: 4 80 24;
  --color-base-oklch: oklch(37.6% 0.111 146.4);
  --color-50: #F0FEF4;
  --color-100: #D8FDE2;
  --color-200: #B2FBC5;
  --color-300: #7EF29C;
  --color-400: #4FE376;
  --color-500: #2BCA55;
  --color-600: #299947;
  --color-700: #236C36;
  --color-800: #1B4626;
  --color-900: #122B19;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  castleton-green: {
    50: '#F0FEF4',
    100: '#D8FDE2',
    200: '#B2FBC5',
    300: '#7EF29C',
    400: '#4FE376',
    500: '#2BCA55',
    600: '#299947',
    700: '#236C36',
    800: '#1B4626',
    900: '#122B19',
  },
}

$base: #045018;
$base-ink: #FFFFFF;
$base-50: #F0FEF4;
$base-100: #D8FDE2;
$base-200: #B2FBC5;
$base-300: #7EF29C;
$base-400: #4FE376;
$base-500: #2BCA55;
$base-600: #299947;
$base-700: #236C36;
$base-800: #1B4626;
$base-900: #122B19;
$base-hover: #033E13;
$base-subtle: #93EBAA;

{
    "color": {
        "base": {
            "value": "#045018",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F0FEF4",
                "type": "color"
            },
            "100": {
                "value": "#D8FDE2",
                "type": "color"
            },
            "200": {
                "value": "#B2FBC5",
                "type": "color"
            },
            "300": {
                "value": "#7EF29C",
                "type": "color"
            },
            "400": {
                "value": "#4FE376",
                "type": "color"
            },
            "500": {
                "value": "#2BCA55",
                "type": "color"
            },
            "600": {
                "value": "#299947",
                "type": "color"
            },
            "700": {
                "value": "#236C36",
                "type": "color"
            },
            "800": {
                "value": "#1B4626",
                "type": "color"
            },
            "900": {
                "value": "#122B19",
                "type": "color"
            }
        }
    }
}

Palettes built on #045018

Color Lab

Pairs with #045018

UI roles & guardrails

In real applications

Scales

Every model

Export