Yellow color · XKCD survey name
Neon Yellow Color Code: #CFFF04
The HEX code for Neon Yellow is #CFFF04. It is a medium, vivid yellow-green color made of 207 red, 255 green and 4 blue (HSL 71°, 100%, 51%). Black text reads best on it (17.95:1 contrast).
Neon Yellow color values
#CFFF04
rgb(207, 255, 4)
hsl(71, 100%, 51%)
71, 98%, 100%
hwb(71 2% 0%)
19%, 0%, 98%, 0%
13631236
CMYK is a standard screen-to-print conversion. Printed results depend on inks, paper and color profiles.
What is Neon Yellow?
“Neon Yellow” is a crowd-sourced name from the XKCD Color Survey, in which participants typed names for colors they were shown. It is a popular everyday label rather than an official standard.
Its hue angle of 71° places it in the yellow-green part of the color wheel, with 100% saturation (vivid) and 51% lightness (medium). It sits between warm and cool.
Compared with the other yellow colors in the Aqeeb Studio library, it is lighter than 21% of them and more saturated than 58% of them.
Its relative luminance is 0.848, which makes it a very light color. That is above the 0.179 crossover point at which black and white text have equal contrast, so black text has the advantage.
Neon Yellow counts as a light color: its HSL lightness is 51% and its relative luminance is 0.848. Black text reads best on it (17.95:1 contrast).
Text contrast on Neon Yellow
| Text | Preview | Ratio | AA normal | AA large | AAA normal | AAA large |
|---|---|---|---|---|---|---|
| White text | Sample text | 1.16:1 Poor | Fail | Fail | Fail | Fail |
| Black text | Sample text | 17.95:1 Excellent | Pass | Pass | Pass | Pass |
Ratios use the WCAG 2 formula and are truncated, never rounded up. Test any pair with the contrast checker.
Colors that go with Neon Yellow
Complementary color
Complementary colors sit directly opposite each other on the color wheel (180° apart). They give the strongest hue contrast, which suits calls to action and accents.
Analogous colors
Analogous colors are neighbors on the wheel, 30° either side of the base hue. They blend smoothly and are easy to combine in backgrounds, gradients and illustrations.
Triadic colors
A triadic scheme uses three hues spaced 120° apart. It is lively yet balanced, and works best when one color leads and the other two act as accents.
Split-complementary colors
Split-complementary keeps the base color and uses the two colors on either side of its complement (150° and 210°). The contrast is strong but gentler than a direct complement.
Tetradic colors
A tetradic (rectangle) scheme combines two complementary pairs at 0°, 60°, 180° and 240°. It offers variety but needs one dominant color to stay balanced.
Monochromatic variants
Monochromatic variants keep the same hue and saturation and only change lightness, which makes them dependable for UI scales and subtle layered designs.
A “≈” before a name means the exact harmony color has no named match, so the link goes to the closest named color.
Tints and shades of Neon Yellow
Lighter tints (mixed with white)
Darker shades (mixed with black)
Select any swatch to copy its HEX code. Build longer scales with the tints and shades tool.
Similar colors
Where to use Neon Yellow
- Card, highlight and section backgrounds with dark text (17.95:1 contrast with black)
- Accents that need to stand out: call-to-action buttons, charts and illustrations
- Backgrounds that need to feel bright
- Accents on dark layouts
- Infographics and chart series
- Highlighters, badges and caution markers
Use Neon Yellow in CSS
:root {
--color-neon-yellow: #CFFF04;
}
.element {
color: var(--color-neon-yellow);
background-color: #CFFF04;
border: 2px solid #CFFF04;
}Questions about Neon Yellow
What is the HEX code for Neon Yellow?
Neon Yellow is #CFFF04.
What is the RGB value of Neon Yellow?
The RGB value of Neon Yellow is 207, 255, 4: 207 red, 255 green and 4 blue on a 0–255 scale, written rgb(207, 255, 4) in CSS.
What is the HSL value of Neon Yellow?
The HSL value of Neon Yellow is 71°, 100%, 51% (hue, saturation, lightness), written hsl(71, 100%, 51%) in CSS.
What is the CMYK value of Neon Yellow?
A standard conversion gives about C 19%, M 0%, Y 98%, K 0%. Real print results depend on the inks, paper and color profile, so treat CMYK here as a reference value.
Is Neon Yellow a light or dark color?
Neon Yellow counts as a light color: its HSL lightness is 51% and its relative luminance is 0.848. Black text reads best on it (17.95:1 contrast).
How does Neon Yellow look with white text?
White text on Neon Yellow has a contrast ratio of 1.16:1, rated Poor. It falls below the WCAG minimum for text.
How does Neon Yellow look with black text?
Black text on Neon Yellow has a contrast ratio of 17.95:1, rated Excellent. It meets WCAG AA for normal text.
What colors go well with Neon Yellow?
Blue is its complementary color, and Amber sits beside it as an analogous color. Lighter and darker variants of the same hue also work well for monochromatic palettes.
Where can Neon Yellow be used?
It suits card, highlight and section backgrounds with dark text (17.95:1 contrast with black); accents that need to stand out: call-to-action buttons, charts and illustrations; backgrounds that need to feel bright.
How do I use Neon Yellow in CSS?
Use color: #CFFF04; for text, background-color: #CFFF04; for fills, or define a custom property such as --color-neon-yellow: #CFFF04; and reuse it with var(--color-neon-yellow).
About this color page
Crowd-sourced name from the XKCD Color Survey (CC0). Values are calculated from the HEX code; color names are labels, not trademarks or standards unless stated. Screens render colors differently, so always check important colors on your own device. See the disclaimer.