Blue (#0000ff) is a medium, vivid blue. It is a CSS named color, so you can use it in stylesheets as color: blue as well as by its hex code. In RGB it is rgb(0, 0, 255); in HSL, hsl(240, 100%, 50%).
| Hex | #0000ff |
|---|---|
| CSS name | blue |
| RGB | rgb(0, 0, 255) |
| HSL | hsl(240, 100%, 50%) |
| CMYK | 100%, 100%, 0%, 0% |
| CSS example | color: #0000ff; background-color: rgb(0, 0, 255); |
The hue stepped through seven lightness levels, each matched to the closest named or web-safe color — useful for backgrounds, borders, text and hover states that all belong to one family. Click any swatch for its full breakdown.
Complementary — maximum contrast, from opposite sides of the color wheel:
Analogous — neighbours on the wheel, naturally harmonious:
Triadic — three colors evenly spaced for balanced variety:
Tetradic — four colors at 90° intervals:
On a #0000ff background, white text gives the better contrast. WCAG requires 4.5:1 for normal text and 3:1 for large text (AA), or 7:1 and 4.5:1 for AAA.
| Text color | Contrast ratio | Normal text | Large text |
|---|---|---|---|
| White text (#ffffff) | 8.59:1 | AAA | AAA |
| Black text (#000000) | 2.44:1 | Fails | Fails |
The CSS named colors closest to #0000ff:
Turn #0000ff into a full scheme with the Color Palette Generator, blend it into a background with the CSS Gradient Generator, or browse all named colors.