Blue
Blue is a medium, vivid color from the blue family. Hex code #0000FF.
Color codes
- CSS name
blue - HEX
#0000FF - RGB
rgb(0 0 255) - HSL
hsl(240 100% 50%) - HSB / HSV
hsb(240, 100%, 100%) - OKLCH
oklch(45.2% 0.313 264.1) - CMYK
cmyk(100%, 100%, 0%, 0%)
White text
8.59:1 · passes WCAG AAA
Black text
2.44:1 · fails WCAG
Shades
Complementary
Analogous
Triadic
About this color
Blue in CSS and design
Blue is a medium, vivid color from the blue family. Blue is one of the 16 basic color keywords, which go back to HTML 4, long before CSS had 148 named colors.
Use it in CSS by name or by any of its codes; these all give the same color:
color: blue;
color: #0000FF;
color: rgb(0 0 255);
color: hsl(240 100% 50%);For text on blue, white reads best. Check other combinations with the contrast checker, or browse all CSS color names.
More tools
Work with this color
- Color picker and converterPick a color and get HEX, RGB, HSL, HSB, CMYK and OKLCH, plus shades and harmonies.
- Contrast checkerCheck text and background colors against WCAG AA and AAA, and fix failing ones.
- CSS color namesAll 148 named colors with hex codes, shades, contrast and matching palettes.
- Palette generatorBuild a color palette from harmony rules, with shades and CSS variables.
Frequently asked questions
What is the hex code for blue?
#0000FF. In CSS you can also use the keyword blue, which works in every browser.
What is blue in RGB and HSL?
In RGB it is rgb(0 0 255), in HSL hsl(240 100% 50%). For print, cmyk(100%, 100%, 0%, 0%) is a starting point, but CMYK depends on paper and ink, so check with your printer.
Should I use black or white text on blue?
White text works better: it has a contrast ratio of 8.59:1 and passes WCAG AAA. Black text reaches 2.44:1.
Which colors go with blue?
Its complementary color is #6D510A, on the opposite side of the color wheel. For a calmer look, combine it with its analogous neighbors #105D7F and #641DC4. The palette generator builds more combinations.