Palettes / Colors / #EFEF28

#EFEF28 — Vivid Yellow

#EFEF28 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 #EFEF28 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.

#EFEF28 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 #2A2AEF; it also sits naturally between #EF8C2A and #8CEF2A. 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 94% · Blue 16%

Cyan 0% · Magenta 0% · Yellow 83% · Key 6%

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

Previews

CSS code for #EFEF28

.text { color: #EFEF28; }
.background { background-color: #EFEF28; }
.border { border: 3px solid #EFEF28; }
.text-rgb { color: rgb(239, 239, 40); }
.text-hsl { color: hsl(60, 86%, 55%); }
.text-shadow-hex { text-shadow: 4px 4px 2px #EFEF28; }
.text-shadow-rgba { text-shadow: 4px 4px 2px rgba(239, 239, 40, 0.8); }
.box-shadow-hex { box-shadow: 1px 1px 3px 2px #EFEF28; }
.box-shadow-rgba { box-shadow: 1px 1px 3px 2px rgba(239, 239, 40, 0.8); }

HTML: <p style="color:#EFEF28">Text here</p> · <div style="background-color:#EFEF28">Div content here</div>

Shades of #EFEF28

Tints of #EFEF28

Tones of #EFEF28

Color harmonies

Complementary — #2A2AEF:

Analogous:

Triadic:

Contrast & accessibility

Best text color on #EFEF28: #000000.

Semi-transparent (opacity) text on #EFEF28

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 #EFEF28 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 #EFEF28 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

← #EFEF27  ·  #EFEF29 →

Frequently asked questions

What color is #EFEF28?

#EFEF28 is Vivid Yellow, a yellow color (RGB 239, 239, 40). Its closest standard named color is Yellow.

What is the RGB and HSL of #EFEF28?

#EFEF28 is RGB 239, 239, 40 — HSL 60°, 86%, 55% — CMYK 0%, 0%, 83%, 6%.

What colors go with #EFEF28?

Its complement is #2A2AEF; analogous partners are #EF8C2A and #8CEF2A. It also appears in 6+ palettes in our collection.

Can I use #EFEF28 for text?

Black text on #EFEF28 has a contrast ratio of 17.05:1 (passes WCAG AA); white text gives 1.23:1.