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blue · cool

#04084b

a deep, electric blue · cool · closest name: Midnight Blue

Token name suggestion: Ink Harbour

RGB
4, 8, 75
HSL
237°, 90%, 16%
CMYK
95, 89, 0, 71
Luminance
0.0071

#04084b is a deep electric blue, 237° on the wheel and 85/100 on the cool side. Put white text on it (18.40:1). As text it scores 18.40:1 on white — safe at any size. Nearest name is Midnight Blue, nearest Tailwind family is slate.

hsl(237 90% 16%)rgb(4 8 75)Base step 950AAA inkCool

At a glance

Every number on this page in one read: what #04084b is made of, how bright it looks, and which way it leans.

Hex
#04084b
Hue
237°
blue
Saturation
90%
electric
Lightness
16%
deep
Brightness
29%
HSV value
Perceived
10%
weighted brightness
Luminance
0.0071
WCAG relative
Temperature
Cool
85/100 cool
Color family
Blue
Tone
Electric
Best ink
White
18.40:1
Closest name
Midnight Blue
ΔE2000 6.8
Chroma
48.2
LCH, 0–130ish
OKLCH L
0.203
perceptual lightness
Tailwind
slate
500 · ΔE 33.3
Web-safe
#000033
nearest of 216
Where it sits
Hue237° of 360°
Saturation90%
Lightness16%
Saturation × lightness field

Left edge is grey, right edge is full chroma; top is white, bottom is black. The dot is #04084b.

Temperature
Warm ← → Cool85% cool

Reads cool. Warm and cool siblings keep the same lightness, so you can swap one in without redoing your contrast maths.

Luminance by channel
Red4%
Green25%
Blue72%

Green carries most of what the eye calls brightness — that is why WCAG weights it 0.7152.

Every format

HEX#04084b
HEX (8-digit)#04084bff
RGBrgb(4, 8, 75)
RGBArgba(4, 8, 75, 1)
HSLhsl(237, 90%, 16%)
HSV / HSBhsv(237, 95%, 29%)
HWBhwb(237 2% 71%)
CMYKcmyk(95%, 89%, 0%, 71%)
LABlab(6.4 26.3 -40.4)
LCHlch(6.4 48.2 303.0)
OKLCHoklch(0.203 0.118 267.2)
XYZ (D65)xyz(1.41, 0.71, 6.72)
Decimal264267
Display P3color(display-p3 0.016 0.031 0.294)
Web-safe#000033

Copy-ready code

every platformclick to select
/* CSS */
color: #04084b;
background-color: #04084b;
/* CSS custom property */
--brand: #04084b;
/* Tailwind (arbitrary) */
class="text-[#04084b] bg-[#04084b]"
/* SCSS */
$brand: #04084b;
/* SwiftUI */
Color(red: 0.016, green: 0.031, blue: 0.294)
/* UIKit */
UIColor(red: 0.016, green: 0.031, blue: 0.294, alpha: 1)
/* Android XML */
<color name="brand">#04084B</color>
/* Android Compose */
Color(0xFF04084B)
/* Flutter */
Color(0xFF04084B)
/* Python / OpenCV (BGR) */
(75, 8, 4)
/* Python / PIL (RGB) */
(4, 8, 75)
/* Java AWT */
new Color(4, 8, 75)
/* .NET */
Color.FromArgb(255, 4, 8, 75)
/* OpenGL / Unity (0–1) */
(0.0157f, 0.0314f, 0.2941f, 1f)
/* LaTeX */
\definecolor{brand}{RGB}{4,8,75}
modern cssclick to select
/* mix without leaving CSS */
background: color-mix(in oklab, #04084b 85%, white);
border-color: color-mix(in oklab, #04084b 40%, transparent);
/* theme-aware in one line */
color: light-dark(#060D79, #D3D4EE);
/* relative colour syntax */
--hover: hsl(from #04084b h s calc(l - 7));

Design tokens

The same ramp in the four formats a team actually needs. Paste one and the whole palette lands with it.

css custom propertiesclick to select
:root {
  --brand-50: #F2F2FD;
  --brand-100: #E5E6FB;
  --brand-200: #C3C6F8;
  --brand-300: #949AF9;
  --brand-400: #5F68F7;
  --brand-500: #2A35F4;
  --brand-600: #0C19E8;
  --brand-700: #0A15C2;
  --brand-800: #08119B;
  --brand-900: #0B1070;
  --brand-950: #04084b;
  --brand: #04084b;
  --brand-ink: #ffffff;
  --brand-surface: #F4F5FA;
  --brand-border: #C0C2ED;
  --brand-hover: #020429;
  --brand-pressed: #000107;
}
@media (prefers-color-scheme: dark) {
  :root {
    --brand-surface: #141524;
    --brand-ink: #D3D4EE;
  }
}
tailwind.config.jsclick to select
theme: {
  extend: {
    colors: {
      brand: {
        50: '#F2F2FD',
        100: '#E5E6FB',
        200: '#C3C6F8',
        300: '#949AF9',
        400: '#5F68F7',
        500: '#2A35F4',
        600: '#0C19E8',
        700: '#0A15C2',
        800: '#08119B',
        900: '#0B1070',
        950: '#04084b',
        DEFAULT: '#04084b',
      },
    },
  },
}
scss mapclick to select
$brand: (
  '50': #F2F2FD,
  '100': #E5E6FB,
  '200': #C3C6F8,
  '300': #949AF9,
  '400': #5F68F7,
  '500': #2A35F4,
  '600': #0C19E8,
  '700': #0A15C2,
  '800': #08119B,
  '900': #0B1070,
  '950': #04084b,
);
$brand-base: #04084b;
$brand-ink: #ffffff;

@function brand($step) { @return map-get($brand, $step); }
w3c design tokens (json)click to select
{
  "color": {
    "brand": {
      "50": { "$value": "#F2F2FD", "$type": "color" },
      "100": { "$value": "#E5E6FB", "$type": "color" },
      "200": { "$value": "#C3C6F8", "$type": "color" },
      "300": { "$value": "#949AF9", "$type": "color" },
      "400": { "$value": "#5F68F7", "$type": "color" },
      "500": { "$value": "#2A35F4", "$type": "color" },
      "600": { "$value": "#0C19E8", "$type": "color" },
      "700": { "$value": "#0A15C2", "$type": "color" },
      "800": { "$value": "#08119B", "$type": "color" },
      "900": { "$value": "#0B1070", "$type": "color" },
      "950": { "$value": "#04084b", "$type": "color" }
    },
    "brandInk": { "$value": "#ffffff", "$type": "color" }
  }
}

Best text color

Only one of black and white can be right. This is the one, with the number that proves it.

Readable at a glance#ffffff on #04084b · 18.40:1
Use #ffffffAAA at every size.
Aa
12px
Aa
16px
Aa
24px
Aa
White text · 18.40:1 · recommended
AA pass · AA large pass · AAA pass
Aa
Black text · 1.14:1
AA fail · AA large fail · AAA fail
Reading the other direction: #04084b as text scores 18.40:1 on white and 1.14:1 on black.
Best tinted ink on it, if plain black or white feels flat: #E7E8FE at 15.22:1.

Make it accessible

A contrast checker tells you that you failed. This tells you what to ship instead — same hue, same saturation, lightness moved only as far as WCAG demands.

The quick fox
#04084b · 18.40:1
AA on whitealready passes
#04084b
The quick fox
#04084b · 18.40:1
AAA on whitealready passes
#04084b
The quick fox
#5D65F6 · 4.66:1
AA on black+51% L
#5D65F6
The quick fox
#888FF9 · 7.34:1
AAA on black+60% L
#888FF9

Large text — 24px regular or 18.66px bold and above — only needs 3:1, so #04084B is enough for headings on white. Non-text elements such as icons, chart strokes and focus rings also sit at 3:1 under WCAG 2.2 (1.4.11).

Accessibility — WCAG contrast

Aa
#04084b on white: 18.40:1
AA ✓ pass · AA-large · AAA
Aa
#04084b on black: 1.14:1
AA ✗ fail · AA-large · AAA
Against the neutral ladder

Contrast is symmetric, so each row covers both directions: #04084b as text on that neutral, and that neutral as text on #04084b.

NeutralRatioBoth directions
White18.40:1AaAa
Slate 5017.58:1AaAa
Slate 10016.79:1AaAa
Slate 20014.92:1AaAa
Slate 30012.39:1AaAa
Slate 4007.17:1AaAa
Slate 5003.87:1AaAa
Slate 6002.43:1AaAa
Slate 7001.78:1AaAa
Slate 8001.26:1AaAa
Slate 9001.03:1AaAa
Black1.14:1AaAa
Colour vision deficiency
true color
protanopia · #00184D
deuteranopia · #00104A
tritanopia · #001D2A

Roughly one man in twelve has some form of colour vision deficiency. If any of the three panels above is hard to tell apart from a neighbouring colour in your palette, add a shape, an icon or a label so the meaning does not rest on hue alone.

Color scale — 50 to 950

A Tailwind-shaped ramp built around this exact hex. #04084b is pinned to step 950; the rest hold its hue and let saturation ease off at the extremes so the pale end never turns neon.

#F2F2FD
#E5E6FB
#C3C6F8
#949AF9
#5F68F7
#2A35F4
#0C19E8
#0A15C2
#08119B
#0B1070
#04084b
Base = 950Lightest = 50 · #F2F2FDDarkest = 950 · #04084bText step on white = 500
Perceptual ramp — OKLCH

The same eleven steps expressed in OKLCH, where equal lightness numbers actually look equally spaced. HSL ramps go muddy in the yellows and washed out in the blues; this one does not. Modern browsers render it natively — the hex ramp above is the fallback.

50100200300400500600700800900950
oklch tokensclick to select
:root {
  --brand-50: oklch(0.97 0.029 267.2);
  --brand-100: oklch(0.94 0.047 267.2);
  --brand-200: oklch(0.88 0.071 267.2);
  --brand-300: oklch(0.80 0.092 267.2);
  --brand-400: oklch(0.72 0.108 267.2);
  --brand-500: oklch(0.64 0.118 267.2);
  --brand-600: oklch(0.56 0.118 267.2);
  --brand-700: oklch(0.48 0.111 267.2);
  --brand-800: oklch(0.40 0.099 267.2);
  --brand-900: oklch(0.32 0.083 267.2);
  --brand-950: oklch(0.24 0.065 267.2);
}

Colors that work with #04084b

Not a palette — a role sheet. Each swatch answers one question you will hit while building the component.

Text on it#ffffff
White wins here
Surface#F4F5FA
Tinted page background
Border#C0C2ED
Hairlines and dividers
Muted text#4B4F9B
Captions on the surface
Accent#4D3602
Second voice, not a rival
Dark variant#060D79
Hover, pressed, headers
Light variant#E7E8FE
Selected rows, tints
Dark surface#141524
Dark-mode background
Hover#020429
One step down in lightness
Pressed#000107
Two steps down
Disabled#4B4D75
Chroma pulled out
Focus ring#000663
Offset from the fill so it reads
Light mode
Everything in its place

Surface, border, heading and body all derive from this one hue, so the screen stays coherent without a second palette.

Primary actionSecondaryBadge
Dark mode
Same hue, inverted

Lightness flips, hue holds. The accent stays the anchor in both themes.

Primary actionSecondaryAccent

In real components

The same eight roles, wired into the interface patterns you will actually build with them. Every state below is a computed value, not a mock-up.

Buttons and states
Save changesHoverPressedDisabled
OutlineSubtleLinkFocused
Form field
you@company.com

Focus ring uses the light variant so the field still reads as one shape.

Send me product updates
Notice
Your export is ready

The file stays available for seven days. Download it before it expires.

NewBetaDraft
Data
Storage used68%
Acme LtdActive
NorthwindTrial
GlobexActive

How to use #04084b

Derived from its contrast, chroma and lightness — not from taste.

Works well for
  • Body text and links on white
  • Primary buttons and calls to action
  • Focus rings, active and selected states
  • Headers, footers and dark-mode surfaces
  • Brand accents, badges and data highlights
Use with care
  • Text on black or near-black surfaces
  • Full-page backgrounds — tiring over long sessions
  • Black text placed on it
  • Pairing with a same-lightness hue — edges vibrate
Minimum size as text on white
Any size
Safe as a fill behind white type
Yes
Safe as a 1px border on white
Yes

Meaning and mood

What a colour in this family tends to signal, and how this particular chroma and lightness change the reading.

trustedcalmcompetentcorporate

The default of institutions for a reason: blue is read as stable and safe across nearly every culture that has been surveyed.

At this chroma the association is amplified — it will dominate anything placed beside it, so give it space and use it sparingly. The low lightness adds weight and formality.

Worth knowing

It is also the most crowded hue on the web. Distinctiveness has to come from your other choices.

Reads as
  • FormalityHigh
  • EnergyHigh
  • Weight85/100
  • TemperatureCool
  • ApproachabilityReserved

Colour associations are cultural and vary by market. Treat these as a starting point for a conversation with your audience, not a finding about them.

Similar colors

One move away from this hex in each direction. Every swatch is its own page.

Color relationships

The wheel positions with their names attached, so you can grab the one you actually need.

Complementary#4B4704
Analogous left#042C4B
Analogous right#23044B
Split-complement 1#4B2304
Split-complement 2#2C4B04
Triadic 1#4B0408
Triadic 2#084B04
Tetradic#4B042C
On the wheel
Base+30°−30°+120°+240°+180°237°

#04084b sits at 237°. Every dot is a harmony position and links to its own page in the table alongside.

RGB percentages

Red1.6%
Green3.1%
Blue29.4%
R · 0–255
4
0x04
G · 0–255
8
0x08
B · 0–255
75
0x4b

CMYK percentages

Cyan94.7%
Magenta89.3%
Yellow0.0%
Key (black)70.6%

Total ink coverage is 255%. Most commercial presses cap around 300% — above that, sheets stop drying properly.

Color previews

#04084b text on a black background

contrast 1.14:1

Card sample

#04084b text on a white background

contrast 18.40:1

Card sample

#04084b on grey

16.79:1

#04084b on its own surface

16.90:1

#04084b on its dark surface

1.02:1

CSS3 live lab

Text font color

The quick brown fox

color: #04084b;
Background color
Panel with #04084b background
background-color: #04084b;
Text shadow — hex

Glowing headline

text-shadow: 2px 2px 8px #04084b;
Text shadow — RGB

Soft neon halo

text-shadow: 0 0 14px rgba(4, 8, 75, 0.45);
Div box shadow
Elevated card
box-shadow: 0 12px 32px -8px rgba(4, 8, 75, 0.45);
Border & gradient
Gradient panel
border: 3px solid #04084b;
background: linear-gradient(135deg, #04084b, #2F044B);
Gradient text

Gradient headline

background: linear-gradient(90deg, #04084b, #41044B);
-webkit-background-clip: text;
color: transparent;
Focus ring
Focused control
outline: 2px solid #04084b;
outline-offset: 3px;
Underline & caret

Marked up text

text-decoration-color: #04084b;
caret-color: #04084b;
Left rule
Pull quote or callout
border-left: 4px solid #04084b;
Ring + tint
Selected chip
background: #E7E8FE;
box-shadow: inset 0 0 0 2px #04084b;
Conic badge
68%
background: conic-gradient(#04084b 68%, #e2e8f0 0);

Transparency

What each alpha value actually composites to. The top row is #04084b over white; the bottom row is the same alpha over a checkerboard, so you can see what survives on a photo or a video.

Bottom row of hexes is the flattened result over white — use those when a design tool refuses transparency, or when you need a solid fallback.

alpha in every syntaxclick to select
rgba(4, 8, 75, 0.5)
rgb(4 8 75 / 50%)
#04084b80
hsl(237 90% 16% / 50%)
color-mix(in srgb, #04084b 50%, transparent)
Alpha8-digit hexFlat on white
10%#04084b1a#E6E6ED
20%#04084b33#CDCEDB
40%#04084b66#9B9CB7
60%#04084b99#686B93
80%#04084bcc#36396F

Gradients from #04084b

Six recipes, each built from this hex and shown with the exact CSS that produced it.

Elevation
Same hue, three lightnesses — safe anywhere
background: linear-gradient(135deg, #070E85, #04084b 45%, #060D79);
Duotone
A short hue run reads richer than a flat fill
background: linear-gradient(120deg, #04084b, #21022E);
Complement sweep
Loud — keep it behind large type only
background: linear-gradient(90deg, #04084b, #4B4704);
Spotlight
Hero panels and app headers
background: radial-gradient(120% 120% at 20% 0%, #0911A2 0%, #04084b 45%, #060D79 100%);
Soft wash
Section backgrounds that stay readable
background: linear-gradient(180deg, #F4F5FA, #ffffff);
Mesh
Ambient background, no image weight
background: radial-gradient(60% 60% at 15% 20%, #07517B 0%, transparent 60%), radial-gradient(55% 55% at 85% 15%, #390668 0%, transparent 60%), radial-gradient(70% 70% at 50% 95%, #060D79 0%, transparent 65%), #04084b;

Monochromatic scale

Palettes built from #04084b

Shades — darker

Tints — lighter

Tones — desaturated

Color harmonies

Nearest named colors

Ranked with CIEDE2000 across all 139 CSS keywords. Under ΔE 2 the eye stops telling them apart; over ΔE 10 they are plainly different colors.

#04084b in the real world

Where a color in this family tends to land, and the interface roles it is usually asked to play.

Industries
TechnologyFinanceHealthcareEnterprise SaaS
Common UI roles
ButtonsLinksFocus statesCharts
Print note

Sits outside most CMYK gamuts — expect a duller press result, or specify a spot ink.

On screens

Very dark values collapse into each other on cheap panels — leave more lightness between your darkest steps than the numbers suggest.

In dark mode

Too dim on dark surfaces at 1.14:1 — lift it to #5D65F6 for body text, or reserve it for fills.

Explore nearby colors

Small, deliberate steps away from this hex — useful when you are hunting for the version of a colour that finally feels right.

#04084b, answered

What color is #04084b?

#04084b is a deep electric blue, closest to Midnight Blue (ΔE2000 6.8). It sits at 237° on the hue wheel with 90% saturation and 16% lightness, which reads as cool.

What is the RGB value of #04084b?

rgb(4, 8, 75) — 4 red, 8 green and 75 blue out of 255, or 1.6% / 3.1% / 29.4% by channel.

What is #04084b in HSL and HSV?

hsl(237, 90%, 16%) and hsv(237, 95%, 29%). HSL is what CSS takes; HSV is what your design tool's picker shows, which is why the saturation numbers rarely match.

Is #04084b a light or a dark color?

It is a dark color. Relative luminance is 0.0071 and perceived brightness is 10%, so white text on it reaches 18.40:1.

Should I use black or white text on #04084b?

White. It scores 18.40:1 against #04084b, versus 1.14:1 for black — AAA at any size.

Is #04084b accessible on a white background?

#04084b on white scores 18.40:1, which clears AAA at every size.

What is the complementary color of #04084b?

#4B4704 sits directly opposite on the wheel. Softer options are the split-complements #4B2304 and #2C4B04, which give the same contrast with far less vibration.

What colors go well with #04084b?

For interface work: #F4F5FA as the surface, #C0C2ED for borders, #4B4F9B for secondary text, #4D3602 as an accent and #060D79 for hover and pressed states. For a palette, the analogous pair #042C4B and #23044B stays calm, while #4B4704 is the loudest partner.

What is #04084b in CMYK for printing?

cmyk(95%, 89%, 0%, 71%). This is a screen-to-ink approximation — a color this saturated sits outside most CMYK gamuts and will print duller than it looks here.

Is #04084b warm or cool?

Cool — it scores 85 on a scale where 0 is the warmest orange and 100 the coolest azure. Nudged warmer it becomes #1A044B; nudged cooler, #031D4C.

Which Tailwind color is closest to #04084b?

The slate family — its 500 step is #64748b, ΔE2000 33.3 away. That is a visible difference, so define #04084b as a custom token rather than reaching for the built-in.

How do I use #04084b in Tailwind CSS?

Inline it as an arbitrary value with bg-[#04084b] or text-[#04084b], or register the whole ramp under theme.extend.colors.brand so you get bg-brand-500 and friends. The generated 50–950 scale on this page is ready to paste into your config.

What is #04084b with 50% opacity?

rgba(4, 8, 75, 0.5), or #04084b80 in eight-digit hex. Over white that composites to #8284A5; over black, #020426.

Is #04084b a web-safe color?

No. The nearest web-safe colour is #000033, ΔE2000 5.6 away. The palette only matters for legacy displays and some email clients now.

What does the color #04084b mean?

As a blue, it reads trusted, calm, competent. The default of institutions for a reason: blue is read as stable and safe across nearly every culture that has been surveyed. At this chroma the effect is amplified — it will dominate whatever sits beside it.

What gradient works with #04084b?

The safest is same-hue elevation: linear-gradient(135deg, #070E85, #04084b 45%, #060D79). For more colour, a short hue run to #21022E keeps it rich without turning muddy.

Work with #04084b in the Color Lab

Every tool opens with this colour already loaded.

Every value on this page is computed from #04084b at request time — conversions, contrast ratios and ΔE distances are calculated, never looked up.