#121E37

#121E37

Color Values

HEX

#121E37

RGB

18, 30, 55

HSL

220.5, 50.7%, 14.3%

HSV

220.5, 67.3%, 21.6%

CMYK

67.3%, 45.5%, 0.0%, 78.4%

OKLCH

0.2384 0.0512 263.6

Properties

Cool Dark Nearest: RAL 5013 Cobalt Blue

Color Harmonies

Complementary

#121E37

#372B12

Analogous

#123037

#181237

#121E37

Triadic

#121E37

#37121E

#1E3712

Split Complementary

#121E37

#371812

#303712

Tetradic

#121E37

#371230

#372B12

#123718

Color Blindness Simulation

Original

#121E37

Protanopia

#171731

Deuteranopia

#161630

Tritanopia

#132C2B

Achromatopsia

#1D1D1D

CSS Usage

background-color: #121E37;
color: #121E37;
border-color: #121E37;
Nearest Tailwind: Slate 900 #0F172A

Tailwind Shades

50
#F4F6FB
100
#E5EAF5
200
#C9D5ED
300
#A3B7E1
400
#7190D0
500
#3F69C0
600
#32549A
700
#28437B
800
#1F3460
900
#1A2947
950
#111A2D

Contrast Checker

Text on white

16.58:1

AA Pass AAA Pass

Text on black

1.27:1

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