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Stack

#8B8F8A

Stack is a neutral medium color with the hex code #8B8F8A. This muted hue can be represented as RGB 139, 143, 138 in digital design or CMYK 3%, 0%, 3%, 44% for print applications. Find matching Pantone color.

Stack color values

HEX
#8B8F8A
RGB
139, 143, 138
HSL
108°, 2%, 55%
CMYK
3, 0, 3, 44

Shades & tints

Darker Lighter

About this color

Stack sits at 108° on the color wheel with 2% saturation and 55% lightness, placing it in the green segment of the spectrum. At near-zero saturation, it reads as a pure gray, with hue playing almost no role in its character. At medium-high lightness, it holds its own on white backgrounds while remaining approachable.

In digital environments, Stack is rendered as rgb(139, 143, 138), where the green channel leads at 143, with red and blue channels close behind. This muted, medium-toned character adapts well to supporting roles: borders, disabled states, secondary text, and structural UI elements.

For print, Stack translates to a CMYK breakdown of 3C 0M 3Y 44K. With a moderate key (44%), 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

Split-Complementary

How to use Stack

CSS Variable 

:root {
  --brand-primary: #8B8F8A;
  --brand-primary-rgb: 139, 143, 138;
}

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

Tailwind Config 

colors: {
  brand: '#8B8F8A',
}

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

Print Design (CMYK) 

C: 3%
M: 0%
Y: 3%
K: 44%

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

RGB for Screens 

rgb(139, 143, 138)
rgba(139, 143, 138, 0.8)

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

Frequently asked questions

What color is #8B8F8A?
#8B8F8A is Stack, a neutral medium color with RGB values of 139, 143, 138. It has a hue of 108°, 2% saturation, and 55% lightness in the HSL color space.
What is the RGB value of #8B8F8A?
The RGB color code for #8B8F8A is rgb(139, 143, 138). This means it contains 139 red, 143 green, and 138 blue in the RGB color model.
Is Stack a warm or cool color?
Stack (#8B8F8A) is a neutral color, sitting between warm and cool on the color wheel.
How do I use #8B8F8A in CSS?
You can use #8B8F8A in CSS with: background-color: #8B8F8A; or color: #8B8F8A; or as an RGB value: rgb(139, 143, 138). For print design, use CMYK: 3%, 0%, 3%, 44%.

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