#151F21

#151F21

Color Values

HEX

#151F21

RGB

21, 31, 33

HSL

190.0, 22.2%, 10.6%

HSV

190.0, 36.4%, 12.9%

CMYK

36.4%, 6.1%, 0.0%, 87.1%

OKLCH

0.2306 0.0148 211.2

Properties

Cool Dark Nearest: RAL 9017 Traffic Black

Color Harmonies

Complementary

#151F21

#211715

Analogous

#15211D

#151921

#151F21

Triadic

#151F21

#21151F

#1F2115

Split Complementary

#151F21

#211519

#211D15

Tetradic

#151F21

#1D1521

#211715

#192115

Color Blindness Simulation

Original

#151F21

Protanopia

#191921

Deuteranopia

#191820

Tritanopia

#162020

Achromatopsia

#1D1D1D

CSS Usage

background-color: #151F21;
color: #151F21;
border-color: #151F21;
Nearest Tailwind: Zinc 900 #18181B

Tailwind Shades

50
#F6F8F9
100
#EAEFF1
200
#D3E1E3
300
#B4CBCF
400
#8CAFB6
500
#63929C
600
#4F757D
700
#3F5E64
800
#32494E
900
#27373A
950
#182325

Contrast Checker

Text on white

16.8:1

AA Pass AAA Pass

Text on black

1.25:1

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