Palettes / Colors / #ECFD37

#ECFD37 — Vivid Yellow

#ECFD37 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 #ECFD37 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.

#ECFD37 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 #4635FD; it also sits naturally between #FDAA35 and #88FD35. 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 99% · Blue 22%

Cyan 7% · Magenta 0% · Yellow 78% · Key 1%

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

Previews

CSS code for #ECFD37

.text { color: #ECFD37; }
.background { background-color: #ECFD37; }
.border { border: 3px solid #ECFD37; }
.text-rgb { color: rgb(236, 253, 55); }
.text-hsl { color: hsl(65, 98%, 60%); }
.text-shadow-hex { text-shadow: 4px 4px 2px #ECFD37; }
.text-shadow-rgba { text-shadow: 4px 4px 2px rgba(236, 253, 55, 0.8); }
.box-shadow-hex { box-shadow: 1px 1px 3px 2px #ECFD37; }
.box-shadow-rgba { box-shadow: 1px 1px 3px 2px rgba(236, 253, 55, 0.8); }

HTML: <p style="color:#ECFD37">Text here</p> · <div style="background-color:#ECFD37">Div content here</div>

Shades of #ECFD37

Tints of #ECFD37

Tones of #ECFD37

Color harmonies

Complementary — #4635FD:

Analogous:

Triadic:

Contrast & accessibility

Best text color on #ECFD37: #000000.

Semi-transparent (opacity) text on #ECFD37

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 #ECFD37 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 #ECFD37 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

← #ECFD36  ·  #ECFD38 →

Frequently asked questions

What color is #ECFD37?

#ECFD37 is Vivid Yellow, a yellow color (RGB 236, 253, 55). Its closest standard named color is Yellow.

What is the RGB and HSL of #ECFD37?

#ECFD37 is RGB 236, 253, 55 — HSL 65°, 98%, 60% — CMYK 7%, 0%, 78%, 1%.

What colors go with #ECFD37?

Its complement is #4635FD; analogous partners are #FDAA35 and #88FD35. It also appears in 6+ palettes in our collection.

Can I use #ECFD37 for text?

Black text on #ECFD37 has a contrast ratio of 18.67:1 (passes WCAG AA); white text gives 1.12:1.