#21237E

#21237E

Color Values

HEX

#21237E

RGB

33, 35, 126

HSL

238.7, 58.5%, 31.2%

HSV

238.7, 73.8%, 49.4%

CMYK

73.8%, 72.2%, 0.0%, 50.6%

OKLCH

0.3249 0.149 273.4

Properties

Cool Dark Nearest: midnightblue

Color Harmonies

Complementary

#21237E

#7E7C21

Analogous

#21527E

#4E217E

#21237E

Triadic

#21237E

#7E2123

#237E21

Split Complementary

#21237E

#7E4E21

#527E21

Tetradic

#21237E

#7E2152

#7E7C21

#217E4E

Color Blindness Simulation

Original

#21237E

Protanopia

#222268

Deuteranopia

#222263

Tritanopia

#215753

Achromatopsia

#292929

CSS Usage

background-color: #21237E;
color: #21237E;
border-color: #21237E;
Nearest Tailwind: Indigo 900 #312E81

Tailwind Shades

50
#F4F4FB
100
#E4E5F6
200
#C6C7F0
300
#9EA0E6
400
#696CD8
500
#3538CA
600
#2A2DA2
700
#222481
800
#1A1C65
900
#17184A
950
#0E0F2F

Contrast Checker

Text on white

13.07:1

AA Pass AAA Pass

Text on black

1.61:1

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