#3F5166

#3F5166

Color Values

HEX

#3F5166

RGB

63, 81, 102

HSL

212.3, 23.6%, 32.4%

HSV

212.3, 38.2%, 40.0%

CMYK

38.2%, 20.6%, 0.0%, 60.0%

OKLCH

0.4285 0.0417 252.6

Properties

Cool Dark Nearest: RAL 7015 Slate Grey

Color Harmonies

Complementary

#3F5166

#66543F

Analogous

#3F6566

#413F66

#3F5166

Triadic

#3F5166

#663F51

#51663F

Split Complementary

#3F5166

#66413F

#65663F

Tetradic

#3F5166

#663F65

#66543F

#3F6641

Color Blindness Simulation

Original

#3F5166

Protanopia

#474761

Deuteranopia

#464460

Tritanopia

#405D5C

Achromatopsia

#4F4F4F

CSS Usage

background-color: #3F5166;
color: #3F5166;
border-color: #3F5166;
Nearest Tailwind: Slate 600 #475569

Tailwind Shades

50
#F6F7F9
100
#EAEDF1
200
#D3DBE4
300
#B3C1D0
400
#8A9FB7
500
#617D9E
600
#4E647E
700
#3E5065
800
#313F4F
900
#26303B
950
#181E25

Contrast Checker

Text on white

8.14:1

AA Pass AAA Pass

Text on black

2.58:1

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