Azure is the CSS named color #F0FFFF — rgb(240, 255, 255), hsl(180, 100%, 97%). Its relative luminance is 0.973, giving 1.03:1 against white and 20.45:1 against black, so it works as a text color on black.
| HEX | #F0FFFF |
|---|---|
| RGB | rgb(240, 255, 255) |
| HSL | hsl(180, 100%, 97%) |
| Relative luminance | 0.9727 |
| Contrast on white | 1.03:1 AA fail |
| Contrast on black | 20.45:1 AA pass |
Built by mixing azure toward white (four steps) and toward black (four steps) while keeping the hue. Use the shades generator for a different step count or to add harmony sets.
Closest by CIELAB distance (ΔE76). For perceptual matching in a design system, compare in OKLab before locking a token.
azure is #F0FFFF, which is rgb(240, 255, 255) and hsl(180, 100%, 97%). It is one of the 148 CSS named colors defined by the CSS Color Module Level 4.
Azure has a relative luminance of 0.973 on a 0–1 scale, so it is a light color. Against white it scores 1.03:1; against black, 20.45:1.
azure reaches 20.45:1 against black, which clears WCAG 2.2 AA for normal text (4.5:1) at any size.