Chartreuse is the CSS named color #7FFF00 — rgb(127, 255, 0), hsl(90, 100%, 50%). Its relative luminance is 0.760, giving 1.30:1 against white and 16.21:1 against black, so it works as a text color on black.
| HEX | #7FFF00 |
|---|---|
| RGB | rgb(127, 255, 0) |
| HSL | hsl(90, 100%, 50%) |
| Relative luminance | 0.7603 |
| Contrast on white | 1.30:1 AA fail |
| Contrast on black | 16.21:1 AA pass |
Built by mixing chartreuse 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.
chartreuse is #7FFF00, which is rgb(127, 255, 0) and hsl(90, 100%, 50%). It is one of the 148 CSS named colors defined by the CSS Color Module Level 4.
Chartreuse has a relative luminance of 0.760 on a 0–1 scale, so it is a light color. Against white it scores 1.30:1; against black, 16.21:1.
chartreuse reaches 16.21:1 against black, which clears WCAG 2.2 AA for normal text (4.5:1) at any size.