Boston Blue

Q: How do I use #4099BF in CSS?

You can use #4099BF in CSS with: background-color: #4099BF; or color: #4099BF; or as an RGB value: rgb(64, 153, 191). For print design, use CMYK: 66%, 20%, 0%, 25%.

#4099BF

Boston Blue is a cool medium color with the hex code #4099BF. This moderately saturated hue can be represented as RGB 64, 153, 191 in digital design or CMYK 66%, 20%, 0%, 25% for print applications. Find matching Pantone color.

Boston Blue color values

HEX: #4099BF
RGB: 64, 153, 191
HSL: 198°, 50%, 50%
CMYK: 66, 20, 0, 25

Shades & tints

Darker Lighter

About this color

Boston Blue sits at 198° on the color wheel with 50% saturation and 50% lightness, placing it in the blue segment of the spectrum. The moderate 50% saturation gives it enough color presence to register clearly without competing for dominance in a composition. 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, Boston Blue is rendered as rgb(64, 153, 191), where the blue channel is highest at 191, anchoring the color in the cool register. This cool mid-tone is a reliable choice for UI chrome, informational states, and contexts that call for a calm, readable presence.

For print, Boston Blue translates to a CMYK breakdown of 66C 20M 0Y 25K. The low-to-moderate black value (25%) means the color's character in print comes primarily from its cyan ink content (66%), with black serving as a supporting shadow tone. 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 Boston Blue

CSS Variable

:root {
  --brand-primary: #4099BF;
  --brand-primary-rgb: 64, 153, 191;
}

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

Tailwind Config

colors: {
  brand: '#4099BF',
}

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

Print Design (CMYK)

C: 66%
M: 20%
Y: 0%
K: 25%

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

RGB for Screens

rgb(64, 153, 191)
rgba(64, 153, 191, 0.8)

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

Brands using similar hue

24 brand s with colors near 198° on the color wheel

Frequently asked questions

What color is #4099BF?

#4099BF is Boston Blue, a cool medium color with RGB values of 64, 153, 191. It has a hue of 198°, 50% saturation, and 50% lightness in the HSL color space.

What is the RGB value of #4099BF?

The RGB color code for #4099BF is rgb(64, 153, 191). This means it contains 64 red, 153 green, and 191 blue in the RGB color model.

Is Boston Blue a warm or cool color?

Boston Blue (#4099BF) is a cool color with a hue between 120-300° on the color wheel.

How do I use #4099BF in CSS?

You can use #4099BF in CSS with: background-color: #4099BF; or color: #4099BF; or as an RGB value: rgb(64, 153, 191). For print design, use CMYK: 66%, 20%, 0%, 25%.