#40EE21

sRGB · 64 / 238 / 33

#40EE21 belongs to the green family. Its hex code tells a screen to mix 64 red, 238 green and 33 blue on a scale of 0 to 255. On the HSL wheel, hue is a position around a circle: 110.9° lands in the green region. Its 85.8% saturation makes it strong in color at this lightness. HSL lightness is 53.1% on a scale from black (0%) to white (100%). Of black and white lettering, black has the clearer light-to-dark separation on this background (13.47:1), which helps the shapes of letters stand out.

Color conversions

sRGB (8-bit): 64, 238, 33
HSL: 110.93°, 85.77%, 53.14%
HSV / HSB: 110.93°, 86.13%, 93.33%
CMYK (approx.): 73.11%, 0.00%, 86.13%, 6.67%
CIE XYZ (D65, Y = 100 for white): 32.962, 62.346, 11.736
CIELAB (D65, 2° observer): 83.097, -75.855, 75.684
WCAG relative luminance: 0.62349
24-bit decimal: 4255265

CMYK uses a profile-free approximation. Printed output depends on the press, ink and paper. Lab uses a D65 white point.

Text contrast

Contrast tells you how clearly lettering separates from #40EE21 in light and dark. The ratio compares relative luminance, a measure of light weighted for human vision. Identical colors give 1:1 and black against white gives 21:1. A ratio of 2.99:1 falls just below the 3:1 AA minimum for large text. Body text needs at least 4.5:1 because its finer strokes are harder to distinguish.

Black text · 13.47:1

Normal text: AAA
Large text: AAA

White text · 1.56:1

Normal text: Fail
Large text: Fail

AA and AAA are WCAG accessibility levels. AAA sets a higher bar: 7:1 for normal text and 4.5:1 for large text. Large text begins at 18 pt regular or 14 pt bold. Ratings use the unrounded ratio. WCAG text contrast guidance

Palettes & scales

Harmonies rotate the hue. Scales mix the starting color with white, black or middle gray in 20% steps in encoded sRGB.

Complementary

#CF21EE sits half a turn (180°) from #40EE21 on the HSL wheel. Keeping saturation and lightness steady while crossing to the opposite hue gives you a contrasting accent. Check text contrast separately before using the pair for lettering.

#40EE21 #CF21EE

Analogous

#A6EE21 and #21EE69 sit 30° to either side of #40EE21. The three hues are neighbors on the wheel, so you can change the color of a border or highlight while keeping it close to the original.

#A6EE21 #40EE21 #21EE69

Triadic

#40EE21, #2140EE and #EE2140 are spaced 120° apart, forming a triangle on the wheel. Try one for the main color and the other two for accents.

#40EE21 #2140EE #EE2140

Split complementary

Start at #40EE21 and look across the wheel. #6921EE and #EE21A6 sit 30° to either side of its exact opposite, giving you two different accent choices.

#40EE21 #6921EE #EE21A6

Square

Starting with #40EE21, each quarter turn (90°) takes you to the next hue: #21A6EE, #CF21EE, then #EE6921. Across the square, #40EE21 pairs with #CF21EE, and #21A6EE with #EE6921.

#40EE21 #21A6EE #CF21EE #EE6921

Tetradic

#40EE21 and #CF21EE are opposites, as are #21EECF and #EE2140. Together they form a rectangle on the wheel, with alternating gaps of 60° and 120°.

#40EE21 #21EECF #CF21EE #EE2140

Tints

Mixing #40EE21 with white in 20% steps produces this scale. The first mixture, #66F14D, keeps 80% of the original. By #D9FCD3, the mixture is 80% white.

#40EE21 #66F14D #8CF57A #B3F8A6 #D9FCD3 #FFFFFF

Shades

Mixing #40EE21 with black in 20% steps produces this scale. The first mixture, #33BE1A, keeps 80% of the original. By #0D3007, the mixture is 80% black.

#40EE21 #33BE1A #268F14 #1A5F0D #0D3007 #000000

Tones

Mixing #40EE21 with middle gray in 20% steps produces this scale. The first mixture, #4DD834, keeps 80% of the original. By #73966D, the mixture is 80% middle gray.

#40EE21 #4DD834 #5AC247 #66AC5A #73966D #808080

Copy color codes

Hex, RGB and HSL are three ways to write this screen color. Paste any of them into a CSS color property.

Hex

#40EE21

RGB

rgb(64 238 33)

HSL

hsl(110.927 85.774% 53.137%)

CSS example

.color-sample {
  background-color: #40EE21;
  color: #000000;
}

Channel breakdown

RGB

#40EE21 uses 64 red, 238 green and 33 blue. Each bar shows how much of that channel’s 0–255 range the screen uses.

Red 25.1%

Green 93.3%

Blue 12.9%

CMYK

A simple CMYK estimate for #40EE21 is 73.1% cyan, 0.0% magenta, 86.1% yellow and 6.7% black. These are ink amounts; a printer profile is needed to predict the result on paper.

Cyan 73.1%

Magenta 0.0%

Yellow 86.1%

Black 6.7%

Nearby colors

The nearest shorthand match is #44EE22. Its matching digit pairs let you write it as #4E2 in CSS. For a modern design, keep #40EE21 when you want an exact match. Use its web-safe neighbor, #33FF33, when matching a legacy palette of 216 colors.

Nearest shorthand · #44EE22 Nearest web-safe · #33FF33

Gradient to complement

#40EE21 #58CC43 #70AA65 #888888 #9F65AA #B743CC #CF21EE

Color vision previews

Compare how #40EE21 appears in each simulation. When two chart lines or status indicators become hard to tell apart, a label, shape or line pattern gives readers another way to distinguish them. Individual perception varies.

Protanopia

A red–green color vision deficiency. Without a distinct response from long-wavelength cones, some reds and greens can look alike, and reds can appear darker.

#F4D700

Deuteranopia

A red–green color vision deficiency. Without a distinct response from medium-wavelength cones, some greens can be difficult to distinguish from reds or browns.

#E1CA40

Tritanopia

A blue–yellow color vision deficiency. Without a distinct response from short-wavelength cones, blue can resemble green, and yellow can resemble pink.

#00E6CB

Protanomaly (50%)

An altered long-wavelength cone response can make reds appear dimmer and harder to distinguish from greens. This swatch shows the model’s halfway setting.

#CCDE03

Deuteranomaly (50%)

An altered medium-wavelength cone response can reduce the visible difference between reds and greens. This swatch shows the model’s halfway setting.

#C3D737

Tritanomaly (50%)

An altered short-wavelength cone response can make blue harder to distinguish from green. This swatch shows the model’s halfway setting.

#4DEA82

Grayscale (luminance)

This design check removes hue and preserves relative luminance so you can compare light and dark areas.

#CFCFCF

Partial grayscale (50% blend)

This design check mixes the original color halfway toward its grayscale equivalent in linear light. Use it to see how a design holds up as color fades.

#9DDF99

Technical reference

CAM16 and CIECAM02 below assume D65 white, an average surround, background Y of 20 against white at 100, and adapting luminance of 4.07 cd/m².

Linear sRGB

These channels scale with emitted light. Use them for lighting calculations and physically meaningful blends.

R 0.05127 G 0.85499 B 0.01521

Display P3

P3 displays can reproduce a wider range of reds and greens. These coordinates reproduce this same sRGB swatch on a color-managed P3 display.

R 0.47768 G 0.92036 B 0.30674

Linear Display P3

These P3 channels are proportional to light, before display encoding.

R 0.19396 G 0.82831 B 0.07662

CIE xyY

The x and y coordinates locate chromaticity on a diagram. Y gives relative luminance on a scale where white is 100.

x 0.308 y 0.582 Y 62.346

CMY

Ideal cyan, magenta and yellow are the complements of the encoded red, green and blue channels.

C % 74.902 M % 6.667 Y % 87.059

Binary RGB

Each eight-bit group represents one channel. Together they store the 24-bit hex color.

01000000 11101110 00100001