Palettes / Colors / #EFFB09

#EFFB09 — Vivid Yellow

#EFFB09 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 #EFFB09 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.

#EFFB09 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 #1509FB; it also sits naturally between #FB8E09 and #76FB09. 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 94% · Green 98% · Blue 4%

Cyan 5% · Magenta 0% · Yellow 96% · Key 2%

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

Previews

CSS code for #EFFB09

.text { color: #EFFB09; }
.background { background-color: #EFFB09; }
.border { border: 3px solid #EFFB09; }
.text-rgb { color: rgb(239, 251, 9); }
.text-hsl { color: hsl(63, 97%, 51%); }
.text-shadow-hex { text-shadow: 4px 4px 2px #EFFB09; }
.text-shadow-rgba { text-shadow: 4px 4px 2px rgba(239, 251, 9, 0.8); }
.box-shadow-hex { box-shadow: 1px 1px 3px 2px #EFFB09; }
.box-shadow-rgba { box-shadow: 1px 1px 3px 2px rgba(239, 251, 9, 0.8); }

HTML: <p style="color:#EFFB09">Text here</p> · <div style="background-color:#EFFB09">Div content here</div>

Shades of #EFFB09

Tints of #EFFB09

Tones of #EFFB09

Color harmonies

Complementary — #1509FB:

Analogous:

Triadic:

Contrast & accessibility

Best text color on #EFFB09: #000000.

Semi-transparent (opacity) text on #EFFB09

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 #EFFB09 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 #EFFB09 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

← #EFFB08  ·  #EFFB0A →

Frequently asked questions

What color is #EFFB09?

#EFFB09 is Vivid Yellow, a yellow color (RGB 239, 251, 9). Its closest standard named color is Yellow.

What is the RGB and HSL of #EFFB09?

#EFFB09 is RGB 239, 251, 9 — HSL 63°, 97%, 51% — CMYK 5%, 0%, 96%, 2%.

What colors go with #EFFB09?

Its complement is #1509FB; analogous partners are #FB8E09 and #76FB09. It also appears in 6+ palettes in our collection.

Can I use #EFFB09 for text?

Black text on #EFFB09 has a contrast ratio of 18.47:1 (passes WCAG AA); white text gives 1.14:1.