Palettes / Colors / #421BEF

#421BEF — Vivid Blue

#421BEF is a blue color we call Vivid Blue, closest to the named color Blue (#0000FF). It belongs to the blue family.

Color name

Closest CSS keyword: blue (#0000FF) — not an exact match. CSS blue gives you #0000FF, a different color; use #421BEF 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.

#421BEF is a cool blue color associated with trust, calm and professionalism. 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 #C8EF1A; it also sits naturally between #1A5EEF and #AC1AEF. 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 26% · Green 11% · Blue 94%

Cyan 72% · Magenta 89% · Yellow 0% · Key 6%

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

Previews

CSS code for #421BEF

.text { color: #421BEF; }
.background { background-color: #421BEF; }
.border { border: 3px solid #421BEF; }
.text-rgb { color: rgb(66, 27, 239); }
.text-hsl { color: hsl(251, 87%, 52%); }
.text-shadow-hex { text-shadow: 4px 4px 2px #421BEF; }
.text-shadow-rgba { text-shadow: 4px 4px 2px rgba(66, 27, 239, 0.8); }
.box-shadow-hex { box-shadow: 1px 1px 3px 2px #421BEF; }
.box-shadow-rgba { box-shadow: 1px 1px 3px 2px rgba(66, 27, 239, 0.8); }

HTML: <p style="color:#421BEF">Text here</p> · <div style="background-color:#421BEF">Div content here</div>

Shades of #421BEF

Tints of #421BEF

Tones of #421BEF

Color harmonies

Complementary — #C8EF1A:

Analogous:

Triadic:

Contrast & accessibility

Best text color on #421BEF: #FFFFFF.

Semi-transparent (opacity) text on #421BEF

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 #421BEF 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 #421BEF 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

← #421BEE  ·  #421BF0 →

Frequently asked questions

What color is #421BEF?

#421BEF is Vivid Blue, a blue color (RGB 66, 27, 239). Its closest standard named color is Blue.

What is the RGB and HSL of #421BEF?

#421BEF is RGB 66, 27, 239 — HSL 251°, 87%, 52% — CMYK 72%, 89%, 0%, 6%.

What colors go with #421BEF?

Its complement is #C8EF1A; analogous partners are #1A5EEF and #AC1AEF. It also appears in 6+ palettes in our collection.

Can I use #421BEF for text?

White text on #421BEF has a contrast ratio of 7.97:1 (passes WCAG AA); black text gives 2.63:1.