#1B4359#1B4359
#1B4359 is a dark, muted cyan. Relative luminance 0.050; OKLCH L 36.5% C 0.059 H 235.6°. Best body text is #FFFFFF at 10.53:1 contrast (WCAG AA passes).
Color values
| HEX | #1B4359 |
|---|---|
| RGB | rgb(27, 67, 89) |
| HSL | hsl(201, 53%, 23%) |
| HSV | hsv(201, 70%, 35%) |
| CMYK | cmyk(69.7%, 24.7%, 0%, 65.1%) |
| CIE-LAB | lab(26.64, -6.18, -17.26) |
| CIE-LCH | lch(26.64, 18.33, 250.30°) |
| OKLab | oklab(36.49% -0.0331 -0.0484) |
| OKLCH | oklch(36.49% 0.059 235.6) |
| XYZ | xyz(4.2616, 4.9682, 10.1836) |
| Luminance | 0.0497 (WCAG relative) |
| Temperature | cool |
| Family | cyan |
Closest named colors
Dark Grey Blue
#29465B
ΔE00 2.46
Dark Slate Blue
#214761
ΔE00 2.48
Dark Blue Grey
#1F3B4D
ΔE00 3.18
Charcoal
#36454F
ΔE00 6.35
Prussian Blue
#004577
ΔE00 7.35
Twilight Blue
#0A437A
ΔE00 8.07
Perceptual scales
Shades
Tints
Tones
OKLCH scale
Color harmonies
complementary
#1B4359 #59311B
analogous
#1B5950 #1B4359 #1B2459
triadic
#1B4359 #591B43 #43591B
tetradic
#1B4359 #501B59 #59311B #24591B
square
#1B4359 #501B59 #59311B #24591B
split-complementary
#1B4359 #591B24 #59501B
monochromatic
#071217 #0D202A #1B4359 #296688 #378AB7
Accessibility & contrast
On white
10.53
#1B4359 on #FFFFFF
AA ✓AA large ✓AAA ✓
On black
1.99
#1B4359 on #000000
AA ✗AA large ✗AAA ✗
Best text color
#FFFFFF on #1B4359
10.53:1 — WCAG AA (normal text) passes
Contrast matrix
| fg \ bg | ##1B4359 | #FFFFFF | #000000 | ##FFFFFF |
|---|---|---|---|---|
| ##1B4359 | 1.00 | 10.53 | 1.99 | 10.53 |
| #FFFFFF | 10.53 | 1.00 | 21.00 | 1.00 |
| #000000 | 1.99 | 21.00 | 1.00 | 21.00 |
| ##FFFFFF | 10.53 | 1.00 | 21.00 | 1.00 |
Color blindness preview
Protanopia (red-blind)
#39425A
Deuteranopia (green-blind)
#303C59
Tritanopia (blue-blind)
#00494A
Achromatopsia (no color)
#3F3F3F
Design tokens & code
CSS
--color: #1b4359; /* rgb */ color: rgb(27, 67, 89); /* oklch */ color: oklch(36.5% 0.059 235.6);
Tailwind
colors: {
custom: {
50: '#5f7788',
500: '#1b4359',
950: '#000000',
},
}SCSS
$custom: #1b4359; $custom-light: #5f7788; $custom-dark: #000000;
JSON
{
"hex": "#1b4359",
"rgb": {
"r": 27,
"g": 67,
"b": 89
},
"hsl": {
"h": 201.29,
"s": 53.448,
"l": 22.745
},
"oklch": {
"l": 0.36488,
"c": 0.05865,
"h": 235.6
},
"luminance": 0.04969
}Semantic roles & 50–950 ramp
primary
#1B4359
secondary
#8F5D41
accent
#7F4BDD
background
#F5F7F8
surface
#EAEDEF
border
#C6C8CA
text
#05080B
muted
#797B7C