Palettes / Colors / #66EA40

#66EA40 — Vivid Green

#66EA40 is a green color we call Vivid Green, closest to the named color YellowGreen (#9ACD32). It belongs to the green family.

Color name

Closest CSS keyword: yellowgreen (#9ACD32) — not an exact match. CSS yellowgreen gives you #9ACD32, a different color; use #66EA40 when you need this exact shade.

Sources: common names follow widely used color-name references; CSS keywords and their hex values follow the CSS Color specification.

#66EA40 is a warm-leaning green color associated with growth, calm and balance. It is saturated enough to be the accent — buttons, highlights and calls to action — while neutrals do the quiet work around it.

Its strongest partner is its complement #C43EEA; it also sits naturally between #B9EA3E and #3EEA6F. In the palettes below you can see it working alongside real color combinations from our collection.

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Color values

RGB & CMYK percentages

Red 40% · Green 92% · Blue 25%

Cyan 56% · Magenta 0% · Yellow 73% · Key 8%

CMYK values are unprofiled approximations for screen reference — not a print-proofing guarantee.

Previews

CSS code for #66EA40

.text { color: #66EA40; }
.background { background-color: #66EA40; }
.border { border: 3px solid #66EA40; }
.text-rgb { color: rgb(102, 234, 64); }
.text-hsl { color: hsl(107, 80%, 58%); }
.text-shadow-hex { text-shadow: 4px 4px 2px #66EA40; }
.text-shadow-rgba { text-shadow: 4px 4px 2px rgba(102, 234, 64, 0.8); }
.box-shadow-hex { box-shadow: 1px 1px 3px 2px #66EA40; }
.box-shadow-rgba { box-shadow: 1px 1px 3px 2px rgba(102, 234, 64, 0.8); }

HTML: <p style="color:#66EA40">Text here</p> · <div style="background-color:#66EA40">Div content here</div>

Shades of #66EA40

Tints of #66EA40

Tones of #66EA40

Color harmonies

Complementary — #C43EEA:

Analogous:

Triadic:

Contrast & accessibility

Best text color on #66EA40: #000000.

Semi-transparent (opacity) text on #66EA40

Text set with opacity blends into the background, so its real contrast is lower than the solid ratios above. Choose a text color and an opacity to see the blended color and its true ratio:

How #66EA40 looks with color blindness

Simulated with standard Machado color-vision-deficiency matrices — useful when this color carries meaning in charts, maps or interfaces:

Closest design-system colors

The nearest matches in the Tailwind CSS, Material Design and Bootstrap palettes — handy when you need a framework class instead of a raw hex:

Palettes with a similar color

These palettes use a close neighbour of #66EA40 rather than the exact color:

Similar colors

The closest colors that actually appear in our palette collection — click any to open its page:

Browse neighbouring colors

← #66EA3F  ·  #66EA41 →

Frequently asked questions

What color is #66EA40?

#66EA40 is Vivid Green, a green color (RGB 102, 234, 64). Its closest standard named color is YellowGreen.

What is the RGB and HSL of #66EA40?

#66EA40 is RGB 102, 234, 64 — HSL 107°, 80%, 58% — CMYK 56%, 0%, 73%, 8%.

What colors go with #66EA40?

Its complement is #C43EEA; analogous partners are #B9EA3E and #3EEA6F. It also appears in 6+ palettes in our collection.

Can I use #66EA40 for text?

Black text on #66EA40 has a contrast ratio of 13.41:1 (passes WCAG AA); white text gives 1.57:1.