Blue #0000FF

CSS Named Color / Web Safe Color

Copy-ready color values

HEX#0000FF

RGBrgb(0, 0, 255)

HSLhsl(240, 100%, 50%)

HSVhsv(240, 100%, 100%)

CMYK approx.cmyk(100, 100, 0, 0)

Color value table

Format	Value	Copy
HEX	`#0000FF`
RGB	`rgb(0, 0, 255)`
HSL	`hsl(240, 100%, 50%)`
HSV	`hsv(240, 100%, 100%)`
CMYK approx.	`cmyk(100, 100, 0, 0)`
CSS keyword	`blue`

Contrast and classification

DarkLightness8.59:1Contrast with white2.44:1Contrast with blackBlue / CyanColor family

Shade and tint preview

White 10%
#1A1AFF

White 30%
#4D4DFF

White 70%
#B3B3FF

White 90%
#E6E6FF

Black 10%
#0000E6

Black 30%
#0000B3

Black 70%
#00004D

Black 90%
#00001A

Harmony palettes

Complementary

#FFFF00

#FFFF3D

Analogous

#0000E0

#001FE0

Triadic

#00FF00

#FF0000

Split complementary

#FFFF2E

#D1D100

Using Blue

Blue works best when it is chosen with contrast, surrounding colors, and interface state in mind. Use the HEX value for static CSS, RGB when you need channel-level control, and HSL when adjusting lightness or saturation for hover states. The CMYK value is an approximate screen-to-print conversion, so print workflows should still rely on calibrated design software or a printer profile.

CSS, SCSS, and Tailwind examples

:root {
  --color-blue: #0000ff;
}

.button-primary {
  background: var(--color-blue);
  color: #ffffff;
}

$blue: #0000ff;

// Tailwind arbitrary value
class="bg-[#0000ff] text-white"