#666E63

#666E63

Color Values

HEX

#666E63

RGB

102, 110, 99

HSL

103.6, 5.3%, 41.0%

HSV

103.6, 10.0%, 43.1%

CMYK

7.3%, 0.0%, 10.0%, 56.9%

OKLCH

0.5279 0.0195 137.1

Properties

Cool Dark Nearest: RAL 7005 Mouse Grey

Color Harmonies

Complementary

#666E63

#6B636E

Analogous

#6C6E63

#636E66

#666E63

Triadic

#666E63

#63666E

#6E6366

Split Complementary

#666E63

#66636E

#6E636C

Tetradic

#666E63

#636C6E

#6B636E

#6E6663

Color Blindness Simulation

Original

#666E63

Protanopia

#696A66

Deuteranopia

#696866

Tritanopia

#666868

Achromatopsia

#6C6C6C

CSS Usage

background-color: #666E63;
color: #666E63;
border-color: #666E63;
Nearest Tailwind: Stone 500 #78716C

Tailwind Shades

50
#F7F8F7
100
#EDEEEC
200
#DADDD9
300
#C0C5BF
400
#9EA69C
500
#7C8679
600
#646B61
700
#50564D
800
#3E433C
900
#2F332E
950
#1E201D

Contrast Checker

Text on white

5.28:1

AA Pass AAA Fail

Text on black

3.98:1

AA Fail AAA Fail

Related Articles

Tutorials

CSS color-mix(): Blend Colors Natively in the Browser

Jan 26, 2026
Tutorials

Building a Color Picker Web Component from Scratch

Jan 21, 2026
Tutorials

Perceptual Color Spaces: Lab, LCH, Oklab, OKLCH

Jan 15, 2026