#EFDA21

sRGB · 239 / 218 / 33

#EFDA21 belongs to the yellow family. Its hex code tells a screen to mix 239 red, 218 green and 33 blue on a scale of 0 to 255. On the HSL wheel, hue is a position around a circle: 53.9° lands in the yellow region. Its 86.6% saturation makes it strong in color at this lightness. HSL lightness is 53.3% 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 (14.72:1), which helps the shapes of letters stand out.

Color conversions

sRGB (8-bit): 239, 218, 33
HSL: 53.88°, 86.55%, 53.33%
HSV / HSB: 53.88°, 86.19%, 93.73%
CMYK (approx.): 0.00%, 8.79%, 86.19%, 6.27%
CIE XYZ (D65, Y = 100 for white): 60.941, 68.604, 11.471
CIELAB (D65, 2° observer): 86.308, -9.832, 81.940
WCAG relative luminance: 0.68603
24-bit decimal: 15718945

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 #EFDA21 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 · 14.72:1

Normal text: AAA
Large text: AAA

White text · 1.43:1

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

#2136EF sits half a turn (180°) from #EFDA21 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.

#EFDA21 #2136EF

Analogous

#EF7321 and #9DEF21 sit 30° to either side of #EFDA21. 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.

#EF7321 #EFDA21 #9DEF21

Triadic

#EFDA21, #21EFDA and #DA21EF are spaced 120° apart, forming a triangle on the wheel. Try one for the main color and the other two for accents.

#EFDA21 #21EFDA #DA21EF

Split complementary

Start at #EFDA21 and look across the wheel. #219DEF and #7321EF sit 30° to either side of its exact opposite, giving you two different accent choices.

#EFDA21 #219DEF #7321EF

Square

Starting with #EFDA21, each quarter turn (90°) takes you to the next hue: #21EF73, #2136EF, then #EF219D. Across the square, #EFDA21 pairs with #2136EF, and #21EF73 with #EF219D.

#EFDA21 #21EF73 #2136EF #EF219D

Tetradic

#EFDA21 and #2136EF are opposites, as are #36EF21 and #DA21EF. Together they form a rectangle on the wheel, with alternating gaps of 60° and 120°.

#EFDA21 #36EF21 #2136EF #DA21EF

Tints

Mixing #EFDA21 with white in 20% steps produces this scale. The first mixture, #F2E14D, keeps 80% of the original. By #FCF8D3, the mixture is 80% white.

#EFDA21 #F2E14D #F5E97A #F9F0A6 #FCF8D3 #FFFFFF

Shades

Mixing #EFDA21 with black in 20% steps produces this scale. The first mixture, #BFAE1A, keeps 80% of the original. By #302C07, the mixture is 80% black.

#EFDA21 #BFAE1A #8F8314 #60570D #302C07 #000000

Tones

Mixing #EFDA21 with middle gray in 20% steps produces this scale. The first mixture, #D9C834, keeps 80% of the original. By #96926D, the mixture is 80% middle gray.

#EFDA21 #D9C834 #C3B647 #ACA45A #96926D #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

#EFDA21

RGB

rgb(239 218 33)

HSL

hsl(53.883 86.555% 53.333%)

CSS example

.color-sample {
  background-color: #EFDA21;
  color: #000000;
}

Channel breakdown

RGB

#EFDA21 uses 239 red, 218 green and 33 blue. Each bar shows how much of that channel’s 0–255 range the screen uses.

Red 93.7%

Green 85.5%

Blue 12.9%

CMYK

A simple CMYK estimate for #EFDA21 is 0.0% cyan, 8.8% magenta, 86.2% yellow and 6.3% black. These are ink amounts; a printer profile is needed to predict the result on paper.

Cyan 0.0%

Magenta 8.8%

Yellow 86.2%

Black 6.3%

Nearby colors

The nearest shorthand match is #EEDD22. Its matching digit pairs let you write it as #ED2 in CSS. For a modern design, keep #EFDA21 when you want an exact match. Use its web-safe neighbor, #FFCC33, when matching a legacy palette of 216 colors.

Nearest shorthand · #EEDD22 Nearest web-safe · #FFCC33

Gradient to complement

#EFDA21 #CDBF43 #AAA366 #888888 #666DAA #4351CD #2136EF

Color vision previews

Compare how #EFDA21 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.

#EFD300

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.

#F5DC34

Tritanopia

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

#FFC9BA

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.

#F0D600

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.

#F3DB2C

Tritanomaly (50%)

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

#F3D579

Grayscale (luminance)

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

#D8D8D8

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.

#E4D9A0

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 0.86316 G 0.70110 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 0.92334 G 0.85780 B 0.31206

Linear Display P3

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

R 0.83439 G 0.70648 B 0.07935

CIE xyY

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

x 0.432 y 0.487 Y 68.604

CMY

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

C % 6.275 M % 14.510 Y % 87.059

Binary RGB

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

11101111 11011010 00100001