#151D21

#151D21

Color Values

HEX

#151D21

RGB

21, 29, 33

HSL

200.0, 22.2%, 10.6%

HSV

200.0, 36.4%, 12.9%

CMYK

36.4%, 12.1%, 0.0%, 87.1%

OKLCH

0.2246 0.0141 229.8

Properties

Cool Dark Nearest: RAL 9011 Graphite Black

Color Harmonies

Complementary

#151D21

#211915

Analogous

#15211F

#151721

#151D21

Triadic

#151D21

#21151D

#1D2115

Split Complementary

#151D21

#211517

#211F15

Tetradic

#151D21

#1F1521

#211915

#172115

Color Blindness Simulation

Original

#151D21

Protanopia

#181920

Deuteranopia

#181720

Tritanopia

#151F1F

Achromatopsia

#1C1C1C

CSS Usage

background-color: #151D21;
color: #151D21;
border-color: #151D21;
Nearest Tailwind: Zinc 900 #18181B

Tailwind Shades

50
#F6F8F9
100
#EAEEF1
200
#D3DEE3
300
#B4C6CF
400
#8CA8B6
500
#63899C
600
#4F6E7D
700
#3F5864
800
#32444E
900
#27343A
950
#182125

Contrast Checker

Text on white

17.08:1

AA Pass AAA Pass

Text on black

1.23:1

AA Fail AAA Fail

Related Articles

Tutorials

Responsive Color: Adapting Colors for Different Screens

Jan 23, 2026
Tutorials

Color for Data Storytelling: Beyond Default Chart Colors

Jan 21, 2026
Tutorials

How to Choose Brand Colors: A Step-by-Step Guide

Jan 18, 2026