#283F7B

#283F7B

Color Values

HEX

#283F7B

RGB

40, 63, 123

HSL

223.4, 50.9%, 32.0%

HSV

223.4, 67.5%, 48.2%

CMYK

67.5%, 48.8%, 0.0%, 51.8%

OKLCH

0.3831 0.1058 265.8

Properties

Cool Dark Nearest: RAL 5017 Traffic Blue

Color Harmonies

Complementary

#283F7B

#7B6428

Analogous

#28697B

#3B287B

#283F7B

Triadic

#283F7B

#7B283F

#3F7B28

Split Complementary

#283F7B

#7B3B28

#697B28

Tetradic

#283F7B

#7B2869

#7B6428

#287B3B

Color Blindness Simulation

Original

#283F7B

Protanopia

#32326C

Deuteranopia

#312F69

Tritanopia

#29615E

Achromatopsia

#3E3E3E

CSS Usage

background-color: #283F7B;
color: #283F7B;
border-color: #283F7B;
Nearest Tailwind: Blue 900 #1E3A8A

Tailwind Shades

50
#F4F6FB
100
#E5EAF5
200
#C9D3ED
300
#A3B4E1
400
#718BD1
500
#3F63C0
600
#324F9A
700
#283F7B
800
#1F3160
900
#1A2747
950
#11182D

Contrast Checker

Text on white

10.06:1

AA Pass AAA Pass

Text on black

2.09:1

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