#283F4F

#283F4F

Color Values

HEX

#283F4F

RGB

40, 63, 79

HSL

204.6, 32.8%, 23.3%

HSV

204.6, 49.4%, 31.0%

CMYK

49.4%, 20.3%, 0.0%, 69.0%

OKLCH

0.3558 0.0401 239.7

Properties

Cool Dark Nearest: RAL 5020 Ocean Blue

Color Harmonies

Complementary

#283F4F

#4F3828

Analogous

#284F4B

#282B4F

#283F4F

Triadic

#283F4F

#4F283F

#3F4F28

Split Complementary

#283F4F

#4F282B

#4F4B28

Tetradic

#283F4F

#4B284F

#4F3828

#2B4F28

Color Blindness Simulation

Original

#283F4F

Protanopia

#32324B

Deuteranopia

#312F4A

Tritanopia

#294847

Achromatopsia

#3B3B3B

CSS Usage

background-color: #283F4F;
color: #283F4F;
border-color: #283F4F;
Nearest Tailwind: Slate 700 #334155

Tailwind Shades

50
#F5F8F9
100
#E8EEF2
200
#D0DDE7
300
#AEC5D6
400
#82A6C0
500
#5687A9
600
#456C87
700
#37566C
800
#2B4455
900
#22333F
950
#162028

Contrast Checker

Text on white

10.97:1

AA Pass AAA Pass

Text on black

1.91:1

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