Palettes / Colors / #ECF03E

#ECF03E — Vivid Yellow

#ECF03E is a yellow color we call Vivid Yellow, closest to the named color GreenYellow (#ADFF2F). It belongs to the yellow family.

#ECF03E is a warm yellow color associated with optimism, attention and cheer. 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 #403DF0; it also sits naturally between #F0993D and #93F03D. 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 93% · Green 94% · Blue 24%

Cyan 2% · Magenta 0% · Yellow 74% · Key 6%

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

Previews

CSS code for #ECF03E

.text { color: #ECF03E; }
.background { background-color: #ECF03E; }
.border { border: 3px solid #ECF03E; }
.text-rgb { color: rgb(236, 240, 62); }
.text-hsl { color: hsl(61, 86%, 59%); }
.text-shadow-hex { text-shadow: 4px 4px 2px #ECF03E; }
.text-shadow-rgba { text-shadow: 4px 4px 2px rgba(236, 240, 62, 0.8); }
.box-shadow-hex { box-shadow: 1px 1px 3px 2px #ECF03E; }
.box-shadow-rgba { box-shadow: 1px 1px 3px 2px rgba(236, 240, 62, 0.8); }

HTML: <p style="color:#ECF03E">Text here</p> · <div style="background-color:#ECF03E">Div content here</div>

Shades of #ECF03E

Tints of #ECF03E

Tones of #ECF03E

Color harmonies

Complementary — #403DF0:

Analogous:

Triadic:

Contrast & accessibility

Best text color on #ECF03E: #000000.

How #ECF03E 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 #ECF03E 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

← #ECF03D  ·  #ECF03F →

Frequently asked questions

What color is #ECF03E?

#ECF03E is Vivid Yellow, a yellow color (RGB 236, 240, 62). Its closest standard named color is GreenYellow.

What is the RGB and HSL of #ECF03E?

#ECF03E is RGB 236, 240, 62 — HSL 61°, 86%, 59% — CMYK 2%, 0%, 74%, 6%.

What colors go with #ECF03E?

Its complement is #403DF0; analogous partners are #F0993D and #93F03D. It also appears in 6+ palettes in our collection.

Can I use #ECF03E for text?

Black text on #ECF03E has a contrast ratio of 17.10:1 (passes WCAG AA); white text gives 1.23:1.