#99ff00 is a medium, vivid green. The closest CSS named color is Chartreuse (#7fff00). In RGB it is rgb(153, 255, 0); in HSL, hsl(84, 100%, 50%).
| Hex | #99ff00 |
|---|---|
| RGB | rgb(153, 255, 0) |
| HSL | hsl(84, 100%, 50%) |
| CMYK | 40%, 0%, 100%, 0% |
| CSS example | color: #99ff00; background-color: rgb(153, 255, 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 #99ff00 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) | 1.26:1 | Fails | Fails |
| Black text (#000000) | 16.66:1 | AAA | AAA |
The CSS named colors closest to #99ff00:
Turn #99ff00 into a full scheme with the Color Palette Generator, blend it into a background with the CSS Gradient Generator, or browse all named colors.