Deep Sky Blue is the CSS named color #00BFFF — rgb(0, 191, 255), hsl(195, 100%, 50%). Its relative luminance is 0.445, giving 2.12:1 against white and 9.90:1 against black, so it works as a text color on black.
| HEX | #00BFFF |
|---|---|
| RGB | rgb(0, 191, 255) |
| HSL | hsl(195, 100%, 50%) |
| Relative luminance | 0.4448 |
| Contrast on white | 2.12:1 AA fail |
| Contrast on black | 9.90:1 AA pass |
Built by mixing deepskyblue 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.
deepskyblue is #00BFFF, which is rgb(0, 191, 255) and hsl(195, 100%, 50%). It is one of the 148 CSS named colors defined by the CSS Color Module Level 4.
Deep Sky Blue has a relative luminance of 0.445 on a 0–1 scale, so it is a dark color. Against white it scores 2.12:1; against black, 9.90:1.
deepskyblue reaches 9.90:1 against black, which clears WCAG 2.2 AA for normal text (4.5:1) at any size.