What color is #045C64?

#045C64 is a dark, vivid cyan. In RGB it is rgb(4, 92, 100), and in HSL hsl(185, 92%, 20%).

Is #045C64 accessible as text?

On white, #045C64 has a contrast ratio of 7.72:1 (passes WCAG AA for body text); on black it is 2.72:1 (fails). For text placed on #045C64, use white for the best readability.

What is the closest Tailwind color to #045C64?

The nearest Tailwind CSS token is teal-800 (#005F5A).

What colors go well with #045C64?

#045C64 pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #620C04. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #045C64 below.

Is #045C64 good for buttons?

#045C64 works well for buttons and highlights, but use white text on #045C64 — black text only reaches 2.72:1, below the 4.5:1 needed for normal-size labels.

Is #045C64 the same as CSS darkslategray?

No — #045C64 is not the CSS named color darkslategray, but darkslategray (#2F4F4F) is the closest CSS named color.

#045C64 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #045C64

Not just a swatch — here's how #045C64 works with other colors. Named schemes with #045C64 in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #045C64 Accent #A6C4BE Surface #DFDABE Secondary #9AA0A0 Anchor #1D3549

Dark Slate Gray opens this coastal palette with sea-glass and warm sand alongside it, grounded by driftwood grey and a deep-navy anchor.

Nordic Calm Accent · 5 colors

Accent #045C64 Secondary #AEB4B8 Surface #F1F2F0 Support #7A94A5 Anchor #2E3236

Dark Slate Gray keeps this Nordic scheme quiet — cool greys and a soft white around it, a muted-blue support and a charcoal anchor.

Tech Product Signal · 5 colors

Signal #045C64 Surface #14161A Highlight #F4F6F8 Secondary #596671 Accent #3F7E85

Dark Slate Gray is the vivid signal in this product UI — on a near-black surface with cool white, a slate grey and a lighter tint of Dark Slate Gray.

Vintage Leather Lead · 5 colors

Lead #045C64 Secondary #715017 Surface #E3DCC0 Accent #395143 Anchor #56233F

Dark Slate Gray 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 #F6F4EF Accent #045C64 Secondary #687D80 Support #979286 Ink #16140F

Dark Slate Gray 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 Dark Slate Gray carrying the quiet middle.

Build a working theme in the generator →

Color Lab

How #045C64 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 30/100

Cool

Reads cool and recessive — calming, technical, good for trust-led UI.

Softness 40/100

Moderate

Middle-weight — neither delicate nor heavy.

Depth 55/100

Moderate

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

Naturalness 6/100

Very low

Reads engineered rather than organic — synthetic, digital.

Vintage feel 47/100

Moderate

A faint retro warmth without tipping into sepia.

Luxury 60/100

High

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

Brand distinctiveness 20/100

Very low

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

UI accent fit 71/100

High

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

Surface fit 35/100

Low

Usable as a tinted surface in measured doses.

Print safety 81/100

Very high

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #045C64

For UI

For branding

For interior

For fashion

People also use #045C64 with

Sea Green Navy Rosewood Platinum Dark Slate Gray

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 7.7:1. Use

Subtle surface Use #BBEDF1 for cards and hover fills. Tint 80

Avoid beside #043B62 — 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 #045C64 at work across the surfaces designers actually ship.

Website / UI

Northwind Sign up

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: #045C64;
  --color-base-rgb: 4 92 100;
  --color-base-oklch: oklch(43.4% 0.073 205.3);
  --color-50: #F0FDFE;
  --color-100: #D8FAFD;
  --color-200: #B1F5FC;
  --color-300: #7CE9F3;
  --color-400: #4DD8E5;
  --color-500: #29BECB;
  --color-600: #28919A;
  --color-700: #22666D;
  --color-800: #1A4347;
  --color-900: #12292B;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  dark-slate-gray: {
    50: '#F0FDFE',
    100: '#D8FAFD',
    200: '#B1F5FC',
    300: '#7CE9F3',
    400: '#4DD8E5',
    500: '#29BECB',
    600: '#28919A',
    700: '#22666D',
    800: '#1A4347',
    900: '#12292B',
  },
}

$base: #045C64;
$base-ink: #FFFFFF;
$base-50: #F0FDFE;
$base-100: #D8FAFD;
$base-200: #B1F5FC;
$base-300: #7CE9F3;
$base-400: #4DD8E5;
$base-500: #29BECB;
$base-600: #28919A;
$base-700: #22666D;
$base-800: #1A4347;
$base-900: #12292B;
$base-hover: #03484E;
$base-subtle: #97E5ED;

{
    "color": {
        "base": {
            "value": "#045C64",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F0FDFE",
                "type": "color"
            },
            "100": {
                "value": "#D8FAFD",
                "type": "color"
            },
            "200": {
                "value": "#B1F5FC",
                "type": "color"
            },
            "300": {
                "value": "#7CE9F3",
                "type": "color"
            },
            "400": {
                "value": "#4DD8E5",
                "type": "color"
            },
            "500": {
                "value": "#29BECB",
                "type": "color"
            },
            "600": {
                "value": "#28919A",
                "type": "color"
            },
            "700": {
                "value": "#22666D",
                "type": "color"
            },
            "800": {
                "value": "#1A4347",
                "type": "color"
            },
            "900": {
                "value": "#12292B",
                "type": "color"
            }
        }
    }
}

Palettes built on #045C64

Color Lab

Pairs with #045C64

UI roles & guardrails

In real applications

Scales

Every model

Export