#90181D

#90181D

Color Values

HEX

#90181D

RGB

144, 24, 29

HSL

357.5, 71.4%, 32.9%

HSV

357.5, 83.3%, 56.5%

CMYK

0.0%, 83.3%, 79.9%, 43.5%

OKLCH

0.4244 0.1544 25.2

Properties

Warm Dark Nearest: firebrick 4

Color Harmonies

Complementary

#90181D

#18908B

Analogous

#901859

#904F18

#90181D

Triadic

#90181D

#1D9018

#181D90

Split Complementary

#90181D

#18904F

#185990

Tetradic

#90181D

#599018

#18908B

#4F1890

Color Blindness Simulation

Original

#90181D

Protanopia

#5C5B1C

Deuteranopia

#636C1B

Tritanopia

#8A1B1B

Achromatopsia

#323232

CSS Usage

background-color: #90181D;
color: #90181D;
border-color: #90181D;
Nearest Tailwind: Red 800 #991B1B

Tailwind Shades

50
#FCF3F3
100
#F8E2E3
200
#F5C2C4
300
#ED969A
400
#E45D63
500
#DB242C
600
#AF1D23
700
#8C171C
800
#6D1216
900
#501114
950
#320B0D

Contrast Checker

Text on white

9.0:1

AA Pass AAA Pass

Text on black

2.33:1

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