#183A5C#183A5C
#183A5C is a dark, moderate cyan. Relative luminance 0.040; OKLCH L 34.1% C 0.072 H 250.7°. Best body text is #FFFFFF at 11.68:1 contrast (WCAG AA passes).
Color values
| HEX | #183A5C |
|---|---|
| RGB | rgb(24, 58, 92) |
| HSL | hsl(210, 59%, 23%) |
| HSV | hsv(210, 74%, 36%) |
| CMYK | cmyk(73.9%, 37%, 0%, 63.9%) |
| CIE-LAB | lab(23.65, 0.39, -23.91) |
| CIE-LCH | lch(23.65, 23.92, 270.93°) |
| OKLab | oklab(34.14% -0.0237 -0.0678) |
| OKLCH | oklch(34.14% 0.072 250.7) |
| XYZ | xyz(3.8208, 3.9926, 10.6924) |
| Luminance | 0.0399 (WCAG relative) |
| Temperature | cool |
| Family | cyan |
Closest named colors
Marine Blue
#01386A
ΔE00 2.96
Marine
#042E60
ΔE00 4.82
Twilight Blue
#0A437A
ΔE00 4.83
Prussian Blue
#004577
ΔE00 5.11
Darkish Blue
#014182
ΔE00 5.42
Dark Slate Blue
#214761
ΔE00 5.88
Perceptual scales
Shades
Tints
Tones
OKLCH scale
Color harmonies
complementary
#183A5C #5C3A18
analogous
#185C5C #183A5C #18185C
triadic
#183A5C #5C183A #3A5C18
tetradic
#183A5C #5C185C #5C3A18 #185C18
square
#183A5C #5C185C #5C3A18 #185C18
split-complementary
#183A5C #5C1818 #5C5C18
monochromatic
#060F18 #0B1B2B #183A5C #25598D #3177BD
Accessibility & contrast
On white
11.68
#183A5C on #FFFFFF
AA ✓AA large ✓AAA ✓
On black
1.80
#183A5C on #000000
AA ✗AA large ✗AAA ✗
Best text color
#FFFFFF on #183A5C
11.68:1 — WCAG AA (normal text) passes
Contrast matrix
| fg \ bg | ##183A5C | #FFFFFF | #000000 | ##FFFFFF |
|---|---|---|---|---|
| ##183A5C | 1.00 | 11.68 | 1.80 | 11.68 |
| #FFFFFF | 11.68 | 1.00 | 21.00 | 1.00 |
| #000000 | 1.80 | 21.00 | 1.00 | 21.00 |
| ##FFFFFF | 11.68 | 1.00 | 21.00 | 1.00 |
Color blindness preview
Protanopia (red-blind)
#2B3C5D
Deuteranopia (green-blind)
#21355B
Tritanopia (blue-blind)
#004246
Achromatopsia (no color)
#383838
Design tokens & code
CSS
--color: #183a5c; /* rgb */ color: rgb(24, 58, 92); /* oklch */ color: oklch(34.1% 0.072 250.7);
Tailwind
colors: {
custom: {
50: '#5e6f8a',
500: '#183a5c',
950: '#000000',
},
}SCSS
$custom: #183a5c; $custom-light: #5e6f8a; $custom-dark: #000000;
JSON
{
"hex": "#183a5c",
"rgb": {
"r": 24,
"g": 58,
"b": 92
},
"hsl": {
"h": 210,
"s": 58.621,
"l": 22.745
},
"oklch": {
"l": 0.3414,
"c": 0.07187,
"h": 250.7
},
"luminance": 0.03993
}Semantic roles & 50–950 ramp
primary
#183A5C
secondary
#93683D
accent
#9446E2
background
#F5F6F8
surface
#E9ECF0
border
#C5C7CB
text
#05070B
muted
#797A7C