#277BB1#277BB1

#277BB1 is a mid, moderate cyan. Relative luminance 0.178; OKLCH L 55.9% C 0.115 H 241.8°. Best body text is #FFFFFF at 4.61:1 contrast (WCAG AA passes).

Color values

HEX	#277BB1
RGB	rgb(39, 123, 177)
HSL	hsl(203, 64%, 42%)
HSV	hsv(203, 78%, 69%)
CMYK	cmyk(78%, 30.5%, 0%, 30.6%)
CIE-LAB	lab(49.22, -5.88, -35.63)
CIE-LCH	lch(49.22, 36.11, 260.63°)
OKLab	oklab(55.9% -0.0541 -0.1009)
OKLCH	oklch(55.9% 0.115 241.8)
XYZ	xyz(15.8524, 17.7697, 44.1809)
Luminance	0.1777 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#277BB1 #B15D27

analogous

#27B1A2 #277BB1 #2736B1

triadic

#277BB1 #B1277B #7BB127

tetradic

#277BB1 #A227B1 #B15D27 #36B127

square

#277BB1 #A227B1 #B15D27 #36B127

split-complementary

#277BB1 #B12736 #B1A227

monochromatic

#11354D #1C587F #277BB1 #409BD5 #72B5E0

Accessibility & contrast

On white

4.61

#277BB1 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.55

#277BB1 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#FFFFFF on #277BB1

4.61:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##277BB1	#FFFFFF	#000000	##FFFFFF
##277BB1	1.00	4.61	4.55	4.61
#FFFFFF	4.61	1.00	21.00	1.00
#000000	4.55	21.00	1.00	21.00
##FFFFFF	4.61	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#627CB3

Deuteranopia (green-blind)

#4F6FB0

Tritanopia (blue-blind)

#00888E

Achromatopsia (no color)

#757575

Design tokens & code

CSS

--color: #277bb1;
/* rgb */ color: rgb(39, 123, 177);
/* oklch */ color: oklch(55.9% 0.115 241.8);

Tailwind

colors: {
  custom: {
    50: '#76a1c8',
    500: '#277bb1',
    950: '#000000',
  },
}

SCSS

$custom: #277bb1;
$custom-light: #76a1c8;
$custom-dark: #000000;

JSON

{
  "hex": "#277bb1",
  "rgb": {
    "r": 39,
    "g": 123,
    "b": 177
  },
  "hsl": {
    "h": 203.478,
    "s": 63.889,
    "l": 42.353
  },
  "oklch": {
    "l": 0.55902,
    "c": 0.11453,
    "h": 241.8
  },
  "luminance": 0.17772
}

Semantic roles & 50–950 ramp

primary

#277BB1

secondary

#C7906D

accent

#8241E7

background

#F7F9FC

surface

#EEF2F8

border

#C9CCD1

text

#0A0E13

muted

#7C7E82

Preview Lab

Preview with #277BB1

Body copy rendered with the generated semantic roles for this colour.

Preview Lab → · Contrast checker → · Palette generator →