Palettes / Colors / #ECFC04

#ECFC04 — Vivid Yellow

#ECFC04 is a yellow color we call Vivid Yellow, closest to the named color Yellow (#FFFF00). It belongs to the yellow family.

Color name

Closest CSS keyword: yellow (#FFFF00) — not an exact match. CSS yellow gives you #FFFF00, a different color; use #ECFC04 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.

#ECFC04 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 #1303FC; it also sits naturally between #FC9003 and #6FFC03. In the palettes below you can see it working alongside real color combinations from our collection.

Copy HEX Copy RGB Copy HSL Download PNG swatch SVG

Color values

RGB & CMYK percentages

Red 93% · Green 99% · Blue 2%

Cyan 6% · Magenta 0% · Yellow 98% · Key 1%

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

Previews

CSS code for #ECFC04

.text { color: #ECFC04; }
.background { background-color: #ECFC04; }
.border { border: 3px solid #ECFC04; }
.text-rgb { color: rgb(236, 252, 4); }
.text-hsl { color: hsl(64, 98%, 50%); }
.text-shadow-hex { text-shadow: 4px 4px 2px #ECFC04; }
.text-shadow-rgba { text-shadow: 4px 4px 2px rgba(236, 252, 4, 0.8); }
.box-shadow-hex { box-shadow: 1px 1px 3px 2px #ECFC04; }
.box-shadow-rgba { box-shadow: 1px 1px 3px 2px rgba(236, 252, 4, 0.8); }

HTML: <p style="color:#ECFC04">Text here</p> · <div style="background-color:#ECFC04">Div content here</div>

Shades of #ECFC04

Tints of #ECFC04

Tones of #ECFC04

Color harmonies

Complementary — #1303FC:

Analogous:

Triadic:

Contrast & accessibility

Best text color on #ECFC04: #000000.

Semi-transparent (opacity) text on #ECFC04

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 #ECFC04 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 #ECFC04 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

← #ECFC03  ·  #ECFC05 →

Frequently asked questions

What color is #ECFC04?

#ECFC04 is Vivid Yellow, a yellow color (RGB 236, 252, 4). Its closest standard named color is Yellow.

What is the RGB and HSL of #ECFC04?

#ECFC04 is RGB 236, 252, 4 — HSL 64°, 98%, 50% — CMYK 6%, 0%, 98%, 1%.

What colors go with #ECFC04?

Its complement is #1303FC; analogous partners are #FC9003 and #6FFC03. It also appears in 6+ palettes in our collection.

Can I use #ECFC04 for text?

Black text on #ECFC04 has a contrast ratio of 18.49:1 (passes WCAG AA); white text gives 1.14:1.