#3F404C

#3F404C

Color Values

HEX

#3F404C

RGB

63, 64, 76

HSL

235.4, 9.4%, 27.3%

HSV

235.4, 17.1%, 29.8%

CMYK

17.1%, 15.8%, 0.0%, 70.2%

OKLCH

0.3752 0.0205 281.6

Properties

Cool Dark Nearest: RAL 7015 Slate Grey

Color Harmonies

Complementary

#3F404C

#4C4B3F

Analogous

#3F474C

#453F4C

#3F404C

Triadic

#3F404C

#4C3F40

#404C3F

Split Complementary

#3F404C

#4C453F

#474C3F

Tetradic

#3F404C

#4C3F47

#4C4B3F

#3F4C45

Color Blindness Simulation

Original

#3F404C

Protanopia

#3F3F49

Deuteranopia

#3F3F48

Tritanopia

#3F4746

Achromatopsia

#414141

CSS Usage

background-color: #3F404C;
color: #3F404C;
border-color: #3F404C;
Nearest Tailwind: Zinc 700 #3F3F46

Tailwind Shades

50
#F7F7F8
100
#ECECEF
200
#D8D8DF
300
#BCBDC8
400
#9899AA
500
#74758B
600
#5C5E70
700
#4A4B59
800
#3A3B46
900
#2C2D35
950
#1C1C21

Contrast Checker

Text on white

10.25:1

AA Pass AAA Pass

Text on black

2.05:1

AA Fail AAA Fail

Related Articles

Tutorials

Building a Color Picker Web Component from Scratch

Feb 20, 2026
Tutorials

Web Color Performance: Gradients, Shadows, and Filters

Feb 19, 2026
Tutorials

Tailwind CSS Colors: Complete Shade System Guide

Feb 19, 2026