#12233D

#12233D

Color Values

HEX

#12233D

RGB

18, 35, 61

HSL

216.3, 54.4%, 15.5%

HSV

216.3, 70.5%, 23.9%

CMYK

70.5%, 42.6%, 0.0%, 76.1%

OKLCH

0.2562 0.0544 258.6

Properties

Cool Dark Nearest: RAL 5013 Cobalt Blue

Color Harmonies

Complementary

#12233D

#3D2C12

Analogous

#12393D

#17123D

#12233D

Triadic

#12233D

#3D1223

#233D12

Split Complementary

#12233D

#3D1712

#393D12

Tetradic

#12233D

#3D1239

#3D2C12

#123D17

Color Blindness Simulation

Original

#12233D

Protanopia

#191A37

Deuteranopia

#181735

Tritanopia

#133231

Achromatopsia

#212121

CSS Usage

background-color: #12233D;
color: #12233D;
border-color: #12233D;
Nearest Tailwind: Slate 800 #1E293B

Tailwind Shades

50
#F4F7FB
100
#E5EBF5
200
#C8D7EF
300
#A1BBE3
400
#6D96D4
500
#3A71C5
600
#2F5A9D
700
#25487E
800
#1D3862
900
#192B48
950
#101B2E

Contrast Checker

Text on white

15.75:1

AA Pass AAA Pass

Text on black

1.33:1

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