Ultramarine

Q: How do I use #1818B4 in CSS?

You can use #1818B4 in CSS with: background-color: #1818B4; or color: #1818B4; or as an RGB value: rgb(24, 24, 180). For print design, use CMYK: 87%, 87%, 0%, 29%.

#1818B4

Ultramarine is a cool medium color with the hex code #1818B4. This vibrant hue can be represented as RGB 24, 24, 180 in digital design or CMYK 87%, 87%, 0%, 29% for print applications. Find matching Pantone color.

Ultramarine color values

HEX: #1818B4
RGB: 24, 24, 180
HSL: 240°, 76%, 40%
CMYK: 87, 87, 0, 29

Shades & tints

Darker Lighter

About this color

Ultramarine sits at 240° on the color wheel with 76% saturation and 40% lightness, placing it in the blue segment of the spectrum. At 76% saturation, the hue is fully legible and confident — richly chromatic without tipping into high-contrast territory. Its mid-range lightness positions it as a mid-tone: neither a background color nor a deep accent, but something in between.

In digital environments, Ultramarine is rendered as rgb(24, 24, 180), where the blue channel is highest at 180, producing a strongly blue character. The mid-range lightness and strong saturation make this versatile for both foreground and background roles, depending on what it is paired against.

For print, Ultramarine translates to a CMYK breakdown of 87C 87M 0Y 29K. With a moderate key (29%), this color uses black to deepen the chromatic channels rather than replace them, a profile that typically holds up well in both offset and digital print. No brands in the brandkit.pro library currently specify this exact hex as a named brand color.

Color harmonies

Complementary

Analogous

Triadic

Split-Complementary

How to use Ultramarine

CSS Variable

:root {
  --brand-primary: #1818B4;
  --brand-primary-rgb: 24, 24, 180;
}

Define as a CSS custom property for consistent theming across your site.

Tailwind Config

colors: {
  brand: '#1818B4',
}

Add to your Tailwind config to use classes like bg-brand.

Print Design (CMYK)

C: 87%
M: 87%
Y: 0%
K: 29%

Use these CMYK values in Adobe Illustrator, InDesign, or print specifications.

RGB for Screens

rgb(24, 24, 180)
rgba(24, 24, 180, 0.8)

Use RGB notation for compatibility or add alpha channel for transparency.

Brands using similar hue

24 brand s with colors near 240° on the color wheel

Frequently asked questions

What color is #1818B4?

#1818B4 is Ultramarine, a cool medium color with RGB values of 24, 24, 180. It has a hue of 240°, 76% saturation, and 40% lightness in the HSL color space.

What is the RGB value of #1818B4?

The RGB color code for #1818B4 is rgb(24, 24, 180). This means it contains 24 red, 24 green, and 180 blue in the RGB color model.

Is Ultramarine a warm or cool color?

Ultramarine (#1818B4) is a cool color with a hue between 120-300° on the color wheel.

How do I use #1818B4 in CSS?

You can use #1818B4 in CSS with: background-color: #1818B4; or color: #1818B4; or as an RGB value: rgb(24, 24, 180). For print design, use CMYK: 87%, 87%, 0%, 29%.