Turquoise is the CSS named color #40E0D0 — rgb(64, 224, 208), hsl(174, 72%, 56%). Its relative luminance is 0.590, giving 1.64:1 against white and 12.79:1 against black, so it works as a text color on black.
| HEX | #40E0D0 |
|---|---|
| RGB | rgb(64, 224, 208) |
| HSL | hsl(174, 72%, 56%) |
| Relative luminance | 0.5896 |
| Contrast on white | 1.64:1 AA fail |
| Contrast on black | 12.79:1 AA pass |
Built by mixing turquoise 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.
turquoise is #40E0D0, which is rgb(64, 224, 208) and hsl(174, 72%, 56%). It is one of the 148 CSS named colors defined by the CSS Color Module Level 4.
Turquoise has a relative luminance of 0.590 on a 0–1 scale, so it is a light color. Against white it scores 1.64:1; against black, 12.79:1.
turquoise reaches 12.79:1 against black, which clears WCAG 2.2 AA for normal text (4.5:1) at any size.