Dark Slate Blue is the CSS named color #483D8B — rgb(72, 61, 139), hsl(248, 39%, 39%). Its relative luminance is 0.066, giving 9.07:1 against white and 2.32:1 against black, so it works as a text color on white.
| HEX | #483D8B |
|---|---|
| RGB | rgb(72, 61, 139) |
| HSL | hsl(248, 39%, 39%) |
| Relative luminance | 0.0658 |
| Contrast on white | 9.07:1 AA pass |
| Contrast on black | 2.32:1 AA fail |
Built by mixing darkslateblue 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.
darkslateblue is #483D8B, which is rgb(72, 61, 139) and hsl(248, 39%, 39%). It is one of the 148 CSS named colors defined by the CSS Color Module Level 4.
Dark Slate Blue has a relative luminance of 0.066 on a 0–1 scale, so it is a dark color. Against white it scores 9.07:1; against black, 2.32:1.
darkslateblue reaches 9.07:1 against white, which clears WCAG 2.2 AA for normal text (4.5:1) at any size.