Dark Blue is the CSS named color #00008B — rgb(0, 0, 139), hsl(240, 100%, 27%). Its relative luminance is 0.019, giving 15.30:1 against white and 1.37:1 against black, so it works as a text color on white.
| HEX | #00008B |
|---|---|
| RGB | rgb(0, 0, 139) |
| HSL | hsl(240, 100%, 27%) |
| Relative luminance | 0.0186 |
| Contrast on white | 15.30:1 AA pass |
| Contrast on black | 1.37:1 AA fail |
Built by mixing darkblue 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.
darkblue is #00008B, which is rgb(0, 0, 139) and hsl(240, 100%, 27%). It is one of the 148 CSS named colors defined by the CSS Color Module Level 4.
Dark Blue has a relative luminance of 0.019 on a 0–1 scale, so it is a dark color. Against white it scores 15.30:1; against black, 1.37:1.
darkblue reaches 15.30:1 against white, which clears WCAG 2.2 AA for normal text (4.5:1) at any size.