Photo in the color Electric lime
Pictured: Electric lime, the closest color we have a photo of (#CCFF00)
rgb(207, 255, 4)
#CFFF04

Neon Yellow #CFFF04 RGB Color Code

Name from the community color list.

Neon Yellow (#CFFF04) is a vivid, very light green. In RGB it is made of 81% red, 100% green and 2% blue (R 207, G 255, B 4). The green channel is the strongest. In HSL it has a hue of 71°, 100% saturation and 51% lightness. Its relative luminance is 0.848, so black text is easier to read on top of it. For print, a rough CMYK match is 19% cyan, 0% magenta, 98% yellow and 0% black. Check it against your printer's ICC profile before you print. It is a cool color. It goes well with warm oranges and reds for contrast. For a calm, matching look, use nearby cool tones.

Open in color picker
ConverterPalette generatorContrast checkerGradient builderUI previewSimilar names

Neon Yellow color codes

#CFFF04 in every common color format. Click a value to copy it.

FormatValueNotesCopy
HEX #CFFF04 Valid CSS
RGB rgb(207, 255, 4) Valid CSS
HSL hsl(71, 100%, 51%) Valid CSS
HSV / HSB hsv(71, 98%, 100%) Not a CSS format
HWB hwb(71 2% 0%) Valid CSS
CMYK cmyk(19%, 0%, 98%, 0%) Approximate (no ICC profile)
OKLCH oklch(93.27% 0.2269 122.43) Valid CSS
OKLab oklab(93.27% -0.1216 0.1915) Valid CSS
CIELAB lab(94.13% -34.65 88.76) D50, as in CSS
CIELCH lch(94.13% 95.29 111.32) Valid CSS
Display P3 color(display-p3 0.8493 0.9945 0.3212) Valid CSS
XYZ (D65) color(xyz-d65 0.6151 0.8479 0.1324) Valid CSS
Decimal 13631236 Integer (0xRRGGBB)

CMYK here is a rough screen match without an ICC profile. See CMYK and print. Relative luminance: 0.8479. Nearest web-safe color: #CCFF00.

Mix Neon Yellow with other colors

See what #CFFF04 makes with red paint, under a green light, printed with cyan ink and in a digital blend with blue. Click a picture to change the colors and amounts in the color mixer.

PaintNeon Yellow and red paintOpen in the color mixer
LightNeon Yellow and green lightOpen in the color mixer
PrintNeon Yellow and cyan inkOpen in the color mixer
DigitalNeon Yellow blended with blueOpen in the color mixer

Use Neon Yellow in your code

Ready to paste into CSS, Sass, Tailwind, iOS, Android and Flutter. Click the icon to copy a line.

WhereCodeCopy
CSS variable--neon-yellow: #CFFF04;
Sass variable$neon-yellow: #CFFF04;
Tailwind CSS v4@theme { --color-neon-yellow: #CFFF04; }
Tailwind CSS v3 configcolors: { 'neon-yellow': '#CFFF04' }
SwiftUIColor(red: 0.812, green: 1, blue: 0.016)
UIKitUIColor(red: 0.812, green: 1, blue: 0.016, alpha: 1)
Android XML<color name="neon_yellow">#FFCFFF04</color>
Flutter and Jetpack ComposeColor(0xFFCFFF04)

Accessibility and contrast

Black text works best on #CFFF04 (17.96:1, AAA). Here is how #CFFF04 does as a text color:

Large heading text
Body text at 16px. The quick brown fox jumps over the lazy dog.
1.17:1 on white
APCA Lc 8
Fails AATry #678000
Large heading text
Body text at 16px. The quick brown fox jumps over the lazy dog.
17.96:1 on black
APCA Lc -97
AAA

Check this color against any background in the contrast checker. WCAG ratios and APCA Lc values measure different things, so one can't stand in for the other. Learn more.

How people with color blindness see Neon Yellow

#CFFF04 next to its complement and its two triadic colors, as seen with each type of color blindness.

  • Normal visionhow most people see it
  • Protanopiano red cones, about 1% of men
  • Deuteranopiano green cones, the most common type
  • Tritanopiano blue cones, very rare
  • Achromatopsiano color at all, very rare

#CFFF04 stays easy to tell apart from its complement and triadic colors for the common types of color blindness. Try your own colors in the color blindness simulator.

About the color Neon Yellow

The highlighter color

The typical highlighter is fluorescent yellow. Its ink gets the glow from a dye called pyranine, according to the Wikipedia article on highlighters. Yellow is also handy because it leaves no shadow on a photocopy.

A yellow with green in it

#CFFF04 is the neon yellow of the xkcd survey from 2010. It has a lot of green, much like a yellow green marker. It is almost the same as fluorescent yellow and electric lime, which are both #CCFF00.

Wikipedia's alphabetical list gives neon yellow as #FFF700 and points to the Crayola list, but no crayon called Neon Yellow appears there. Black text on #CFFF04 scores 17.96 to 1. White text scores 1.17 to 1 and can't be read.

Neon Yellow in a user interface

A sample app screen with #CFFF04 as the main color, on a light and a dark theme.

Light theme

Dark theme

Buttons and bars use #CFFF04 as it is. On the light theme, #CFFF04 is too hard to read as text (1.17:1), so links, the badge and outline text use #678000 there (4.50:1). Build a full color scheme around it in the UI color preview.

Color harmonies for Neon Yellow

These schemes turn the hue of #CFFF04 around the color wheel. Each swatch links to its own page.

Complementary

Two colors on opposite sides of the wheel. This gives the most contrast.

Open palette
this#CFFF04#3404FF

Analogous

Hues that sit next to each other and look good together.

Open palette
#FFB204this#CFFF04#52FF04

Triadic

Three hues spaced evenly around the wheel. Bold, but still balanced.

Open palette
this#CFFF04#04CFFF#FF04CF

Split complementary

A base color plus the two hues on each side of its opposite. Strong contrast that clashes less.

Open palette
this#CFFF04#0451FF#B204FF

Tetradic (rectangle)

Two pairs of opposite colors. Let one color lead and use the others less.

Open palette
this#CFFF04#04FF34#3404FF#FF04CF

Square

Four hues 90° apart, spread evenly around the wheel.

Open palette
this#CFFF04#04FFB2#3404FF#FF0452

Monochromatic

One hue at different levels of lightness and saturation.

Open palette
#526600#96B900#D1FF0D#E1FF60#F0FFB3

Gradients with Neon Yellow

Four CSS gradients made from #CFFF04. Copy the code, or open one in the gradient generator to change it.

Soft tint

From a pale tint to the full color.

background: linear-gradient(90deg, #F6FFE2, #CFFF04);

Edit in the gradient generator

Deep shade

The color fading into a dark shade.

background: linear-gradient(180deg, #CFFF04, #384800);

Edit in the gradient generator

Analogous

Its two neighbors on the color wheel.

background: linear-gradient(135deg, #FFB204, #CFFF04, #52FF04);

Edit in the gradient generator

Triadic

A bold blend with a triadic color, through a clean middle.

background: linear-gradient(135deg, #CFFF04, #86EBB3, #04CFFF);

Edit in the gradient generator

Shades, tints and tones of Neon Yellow

Shades are darker, tints are lighter and tones are grayer. We make them in OKLCH so the steps look even. Hover a step to see its code, or click it to open it.

Design system scale (50 to 950)

Neon Yellow sits at step 100. Export the full scale as CSS variables or Tailwind tokens from the picker.

  1. 50
    EEFFCC
  2. 100
    CFFF04
  3. 200
    CAEA7A
  4. 300
    ACD32A
  5. 400
    90B300
  6. 500
    779300
  7. 600
    5F7700
  8. 700
    4B5E00
  9. 800
    3A4A00
  10. 900
    2A3600
  11. 950
    182100

Closest RAL, Tailwind and CSS colors

The nearest match to #CFFF04 in three color systems that designers and builders use.

RAL ClassicRAL 1026 Luminous yellow#FFFF00, close (ΔE 6.2)Tailwind CSSlime-300 #BEF264, close (ΔE 6.2)CSS color namesgreenyellow #ADFF2F, very close (ΔE 3.7)

ΔE is the distance in OKLab: under 2 is hard to see, over 10 is a clearly different color. Browse all RAL colors, the Tailwind palette or the 148 CSS color names. RAL values on screens are only a guide, so check a real color chart before you order paint.

The named colors that look closest to this one (ΔE in OKLab). Browse all shades of green or search the color library.