International Klein Blue

Q: How do I use #00239C in CSS?

You can use #00239C in CSS with: background-color: #00239C; or color: #00239C; or as an RGB value: rgb(0, 35, 156). For print design, use CMYK: 100%, 78%, 0%, 39%.

#00239C

International Klein Blue is a cool dark color with the hex code #00239C. This vibrant hue can be represented as RGB 0, 35, 156 in digital design or CMYK 100%, 78%, 0%, 39% for print applications. Find matching Pantone color.

International Klein Blue color values

HEX: #00239C
RGB: 0, 35, 156
HSL: 227°, 100%, 31%
CMYK: 100, 78, 0, 39

Shades & tints

Darker Lighter

About this color

International Klein Blue sits at 227° on the color wheel with 100% saturation and 31% lightness, placing it in the blue segment of the spectrum. With saturation at 100%, this is a high-chroma color: the kind that anchors palettes and demands considered placement. The lower lightness gives it weight and depth, lending gravity to any palette it enters.

In digital environments, International Klein Blue is rendered as rgb(0, 35, 156), where the blue channel is highest at 156, producing a strongly blue character. High saturation combined with low lightness creates deep, jewel-toned results — useful for premium UI elements, hover states, and focused interaction areas.

For print, International Klein Blue translates to a CMYK breakdown of 100C 78M 0Y 39K. With a moderate key (39%), 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 International Klein Blue

CSS Variable

:root {
  --brand-primary: #00239C;
  --brand-primary-rgb: 0, 35, 156;
}

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

Tailwind Config

colors: {
  brand: '#00239C',
}

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

Print Design (CMYK)

C: 100%
M: 78%
Y: 0%
K: 39%

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

RGB for Screens

rgb(0, 35, 156)
rgba(0, 35, 156, 0.8)

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

Brands using similar hue

24 brand s with colors near 227° on the color wheel

Frequently asked questions

What color is #00239C?

#00239C is International Klein Blue, a cool dark color with RGB values of 0, 35, 156. It has a hue of 227°, 100% saturation, and 31% lightness in the HSL color space.

What is the RGB value of #00239C?

The RGB color code for #00239C is rgb(0, 35, 156). This means it contains 0 red, 35 green, and 156 blue in the RGB color model.

Is International Klein Blue a warm or cool color?

International Klein Blue (#00239C) is a cool color with a hue between 120-300° on the color wheel.

How do I use #00239C in CSS?

You can use #00239C in CSS with: background-color: #00239C; or color: #00239C; or as an RGB value: rgb(0, 35, 156). For print design, use CMYK: 100%, 78%, 0%, 39%.