#66ffff is a light, vivid cyan. The closest CSS named color is Aquamarine (#7fffd4). In RGB it is rgb(102, 255, 255); in HSL, hsl(180, 100%, 70%).
| Hex | #66ffff |
|---|---|
| RGB | rgb(102, 255, 255) |
| HSL | hsl(180, 100%, 70%) |
| CMYK | 60%, 0%, 0%, 0% |
| CSS example | color: #66ffff; background-color: rgb(102, 255, 255); |
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 #66ffff background, black 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) | 1.21:1 | Fails | Fails |
| Black text (#000000) | 17.31:1 | AAA | AAA |
The CSS named colors closest to #66ffff:
Turn #66ffff into a full scheme with the Color Palette Generator, blend it into a background with the CSS Gradient Generator, or browse all named colors.