#660000 is a very dark, vivid red. The closest CSS named color is Maroon (#800000). In RGB it is rgb(102, 0, 0); in HSL, hsl(0, 100%, 20%).
| Hex | #660000 |
|---|---|
| RGB | rgb(102, 0, 0) |
| HSL | hsl(0, 100%, 20%) |
| CMYK | 0%, 100%, 100%, 60% |
| CSS example | color: #660000; background-color: rgb(102, 0, 0); |
The hue stepped through seven lightness levels, each matched to the closest named or web-safe color — useful for backgrounds, borders, text and hover states that all belong to one family. Click any swatch for its full breakdown.
Complementary — maximum contrast, from opposite sides of the color wheel:
Analogous — neighbours on the wheel, naturally harmonious:
Triadic — three colors evenly spaced for balanced variety:
Tetradic — four colors at 90° intervals:
On a #660000 background, white text gives the better contrast. WCAG requires 4.5:1 for normal text and 3:1 for large text (AA), or 7:1 and 4.5:1 for AAA.
| Text color | Contrast ratio | Normal text | Large text |
|---|---|---|---|
| White text (#ffffff) | 13.42:1 | AAA | AAA |
| Black text (#000000) | 1.56:1 | Fails | Fails |
The CSS named colors closest to #660000:
Turn #660000 into a full scheme with the Color Palette Generator, blend it into a background with the CSS Gradient Generator, or browse all named colors.