#283B4D

#283B4D

Color Values

HEX

#283B4D

RGB

40, 59, 77

HSL

209.2, 31.6%, 22.9%

HSV

209.2, 48.1%, 30.2%

CMYK

48.1%, 23.4%, 0.0%, 69.8%

OKLCH

0.3443 0.0401 247.7

Properties

Cool Dark Nearest: RAL 5020 Ocean Blue

Color Harmonies

Complementary

#283B4D

#4D3A28

Analogous

#284D4C

#28284D

#283B4D

Triadic

#283B4D

#4D283B

#3B4D28

Split Complementary

#283B4D

#4D2828

#4D4C28

Tetradic

#283B4D

#4C284D

#4D3A28

#284D28

Color Blindness Simulation

Original

#283B4D

Protanopia

#303049

Deuteranopia

#2F2E48

Tritanopia

#294544

Achromatopsia

#383838

CSS Usage

background-color: #283B4D;
color: #283B4D;
border-color: #283B4D;
Nearest Tailwind: Slate 700 #334155

Tailwind Shades

50
#F5F7F9
100
#E8EDF2
200
#D0DCE7
300
#AEC2D5
400
#83A1BE
500
#5781A8
600
#466786
700
#38526B
800
#2C4054
900
#23313E
950
#161F27

Contrast Checker

Text on white

11.52:1

AA Pass AAA Pass

Text on black

1.82:1

AA Fail AAA Fail

Related Articles

Tutorials

Building a Color Picker Web Component from Scratch

Feb 20, 2026
Tutorials

Web Color Performance: Gradients, Shadows, and Filters

Feb 19, 2026
Tutorials

Tailwind CSS Colors: Complete Shade System Guide

Feb 19, 2026