Night Blue Color Code: #040348, RGB & HSL

Night Blue color values

HEX #040348

RGB rgb(4, 3, 72)

HSL hsl(241, 92%, 15%)

HSV 241, 96%, 28%

HWB hwb(241 1% 72%)

CMYK 94%, 96%, 0%, 72%

Decimal 262984

15%HSL lightness (dark)

92%HSL saturation (vivid)

241°Hue angle (blue)

0.006Relative luminance

CMYK is a standard screen-to-print conversion. Printed results depend on inks, paper and color profiles.

What is Night Blue?

“Night Blue” is a crowd-sourced name from the XKCD Color Survey, in which participants typed names for colors they were shown. It is a popular everyday label rather than an official standard.

Its hue angle of 241° places it in the blue part of the color wheel, with 92% saturation (vivid) and 15% lightness (dark). It is a cool color.

Compared with the other blue colors in the Aqeeb Studio library, it is lighter than 3% of them and more saturated than 53% of them.

Its relative luminance is 0.006, which makes it a very dark color. That is below the 0.179 crossover point at which black and white text have equal contrast, so white text has the advantage.

Night Blue counts as a dark color: its HSL lightness is 15% and its relative luminance is 0.006. White text reads comfortably on it (18.88:1 contrast).

Text contrast on Night Blue

WCAG contrast of white and black text on Night Blue
Text	Preview	Ratio	AA normal	AA large	AAA normal	AAA large
White text	Sample text	18.88:1 Excellent	Pass	Pass	Pass	Pass
Black text	Sample text	1.11:1 Poor	Fail	Fail	Fail	Fail

Ratios use the WCAG 2 formula and are truncated, never rounded up. Test any pair with the contrast checker.

Colors that go with Night Blue

Complementary color

Complementary colors sit directly opposite each other on the color wheel (180° apart). They give the strongest hue contrast, which suits calls to action and accents.

≈ Green Brown#474803

Analogous colors

Analogous colors are neighbors on the wheel, 30° either side of the base hue. They blend smoothly and are easy to combine in backgrounds, gradients and illustrations.

≈ Marine#032548 ≈ Dark Indigo#260348

Triadic colors

A triadic scheme uses three hues spaced 120° apart. It is lively yet balanced, and works best when one color leads and the other two act as accents.

≈ Mahogany#480403 ≈ Bottle Green#034804

Split-complementary colors

Split-complementary keeps the base color and uses the two colors on either side of its complement (150° and 210°). The contrast is strong but gentler than a direct complement.

≈ Chocolate Brown#482703 ≈ Navy Green#254803

Tetradic colors

A tetradic (rectangle) scheme combines two complementary pairs at 0°, 60°, 180° and 240°. It offers variety but needs one dominant color to stay balanced.

≈ Deep Violet#480347 ≈ Green Brown#474803 ≈ Bottle Green#034804

Monochromatic variants

Monochromatic variants keep the same hue and saturation and only change lightness, which makes them dependable for UI scales and subtle layered designs.

#02011D#02011D

#050462#050462

#0907A6#0907A6

#0D0AEB#0D0AEB

#4845F7#4845F7

A “≈” before a name means the exact harmony color has no named match, so the link goes to the closest named color.

Tints and shades of Night Blue

Lighter tints (mixed with white)

Darker shades (mixed with black)

Select any swatch to copy its HEX code. Build longer scales with the tints and shades tool.

Dark Indigo#1F0954 Navy Blue#001146 Midnight Blue#191970 Midnight Purple#280137 Dark Navy#000435 Deep Purple#36013F Very Dark Purple#2A0134 Dark Purple#35063E

Where to use Night Blue

Button, banner and badge backgrounds with white text (18.88:1 contrast)
Dark-mode surfaces, headers and footers
Corporate, finance and software branding
Headers and navigation bars
Charts and dashboards
Links, buttons and primary interface accents

Use Night Blue in CSS

:root {
  --color-night-blue: #040348;
}

.element {
  color: var(--color-night-blue);
  background-color: #040348;
  border: 2px solid #040348;
}

Questions about Night Blue

What is the HEX code for Night Blue?

Night Blue is #040348.

What is the RGB value of Night Blue?

The RGB value of Night Blue is 4, 3, 72: 4 red, 3 green and 72 blue on a 0–255 scale, written rgb(4, 3, 72) in CSS.

What is the HSL value of Night Blue?

The HSL value of Night Blue is 241°, 92%, 15% (hue, saturation, lightness), written hsl(241, 92%, 15%) in CSS.

What is the CMYK value of Night Blue?

A standard conversion gives about C 94%, M 96%, Y 0%, K 72%. Real print results depend on the inks, paper and color profile, so treat CMYK here as a reference value.

Is Night Blue a light or dark color?

Night Blue counts as a dark color: its HSL lightness is 15% and its relative luminance is 0.006. White text reads comfortably on it (18.88:1 contrast).

How does Night Blue look with white text?

White text on Night Blue has a contrast ratio of 18.88:1, rated Excellent. It meets WCAG AA for normal text.

How does Night Blue look with black text?

Black text on Night Blue has a contrast ratio of 1.11:1, rated Poor. It falls below the WCAG minimum for text.

What colors go well with Night Blue?

Green Brown is its complementary color, and Marine sits beside it as an analogous color. Lighter and darker variants of the same hue also work well for monochromatic palettes.

Where can Night Blue be used?

It suits button, banner and badge backgrounds with white text (18.88:1 contrast); dark-mode surfaces, headers and footers; corporate, finance and software branding.

How do I use Night Blue in CSS?

Use color: #040348; for text, background-color: #040348; for fills, or define a custom property such as --color-night-blue: #040348; and reuse it with var(--color-night-blue).

About this color page

Crowd-sourced name from the XKCD Color Survey (CC0). Values are calculated from the HEX code; color names are labels, not trademarks or standards unless stated. Screens render colors differently, so always check important colors on your own device. See the disclaimer.

Night Blue Color Code: #040348